Before We Start
Corticosteroids — powerful, widely used, and loaded with consequences
Corticosteroids (prednisone, methylprednisolone, dexamethasone, hydrocortisone) are some of the most prescribed medications in medicine. They treat everything from asthma and allergic reactions to autoimmune diseases, organ transplant rejection, and inflammatory conditions. In the short term, they are lifesaving. Used long-term or at high doses, they cause a predictable and serious constellation of side effects that every nurse must recognize.
The CUSHINGS mnemonic — named for Cushing syndrome, which is caused by excess cortisol — gives you eight categories of corticosteroid side effects. These are not rare or unpredictable. They are expected, dose-related, and duration-related. The longer and higher the steroid dose, the more pronounced these effects become.
💡 How Corticosteroids Work
Corticosteroids are synthetic versions of cortisol — the body's natural stress hormone produced by the adrenal glands. They suppress the immune system and reduce inflammation by blocking the production of inflammatory mediators (prostaglandins, leukotrienes, cytokines). This is why they work for so many inflammatory and autoimmune conditions — they dampen the immune response broadly. The problem is that the immune system does many essential things beyond causing disease, and suppressing it broadly causes the side effects in CUSHINGS.
The Mnemonic
CUSHINGS — eight categories of corticosteroid side effects
C — Cataracts
Steroids cause posterior subcapsular cataracts with long-term use
Long-term corticosteroid use — even inhaled steroids at high doses — causes accumulation of proteins in the lens of the eye, forming posterior subcapsular cataracts. These differ from age-related cataracts in their location (back of the lens) and their association with steroids even in young patients.
Clinical significance: A 35-year-old patient with rheumatoid arthritis on prednisone for 5 years developing cataracts is a steroid effect, not coincidence. Regular ophthalmology follow-up is recommended for patients on long-term steroid therapy.
Other eye effects: Steroids also increase intraocular pressure — a risk for patients with or at risk for glaucoma. Eye pressure monitoring is important in long-term steroid users.
U — Ulcers (GI)
Steroids reduce the stomach's protective lining — peptic ulcer risk
Corticosteroids reduce prostaglandin synthesis in the GI tract. Prostaglandins normally stimulate mucus production and bicarbonate secretion — the stomach's protective lining against acid. Without adequate prostaglandins, the stomach lining becomes vulnerable to acid damage, causing peptic ulcers and gastritis.
The combination that doubles the risk: Steroids + NSAIDs together dramatically increase GI ulcer risk — both drugs suppress prostaglandins through different mechanisms. This combination should be avoided unless clinically necessary, and a proton pump inhibitor (PPI) should be given prophylactically.
Nursing education: Take steroids with food or milk to reduce GI irritation. Report epigastric pain, dark tarry stools (GI bleed), or coffee-ground emesis to the provider immediately.
GI prophylaxis: Patients on long-term steroids — especially combined with NSAIDs or anticoagulants — should receive a PPI (omeprazole, pantoprazole) to protect the gastric mucosa.
💊 "Steroids with food." Every time. Never on an empty stomach. The GI effects are reduced significantly by taking steroids with meals. This is patient education that nurses should reinforce at every encounter.
S — Skin thinning (and wound healing impairment)
Steroids break down skin collagen and impair repair
Corticosteroids inhibit collagen synthesis and fibroblast activity — two processes essential for skin integrity and wound healing. With long-term use, the skin becomes thin, fragile, and bruises easily. Minor trauma causes large, dramatic bruising (ecchymosis) that looks alarming but represents superficial bleeding into thin skin.
Wound healing impairment: Post-operative patients on chronic steroids heal more slowly and are at higher risk for wound dehiscence (the wound opening) and infection. Surgical teams must be informed about steroid use.
Striae: Purple or red stretch marks (striae) are a classic Cushing syndrome finding — caused by rapid weight gain combined with skin thinning and collagen breakdown.
Nursing skin assessment: Patients on long-term steroids need frequent skin integrity assessment. Fragile skin breaks down easily with tape removal, positioning, and even clothing friction.
H — Hypertension
Steroids retain sodium and water — raising blood pressure
Corticosteroids have mineralocorticoid activity — they cause the kidneys to retain sodium (and with it, water) and excrete potassium. Sodium and water retention increases blood volume and raises blood pressure. This effect is dose-dependent and more pronounced with higher-potency mineralocorticoid steroids like hydrocortisone and fludrocortisone.
The dual consequence:
• Hypertension from sodium/water retention — monitor BP regularly on steroids
• Hypokalemia from potassium wasting — monitor potassium, supplement if needed
Edema: Fluid retention causes peripheral edema — swollen ankles, puffiness, weight gain. The characteristic "moon face" and "buffalo hump" of Cushing syndrome are caused by fluid retention and fat redistribution.
💊 "Steroids retain salt, lose potassium." The same pattern as loop and thiazide diuretics — but steroids cause it through a different mechanism. Patients on high-dose steroids may need a low-sodium diet and potassium-rich foods or supplements.
I — Immunosuppression
Steroids turn down the immune system — infections go unnoticed and uncontrolled
Immunosuppression is the therapeutic mechanism of steroids — and their most dangerous adverse effect in long-term use. By suppressing T-cell function, neutrophil activity, and inflammatory signaling, steroids leave patients vulnerable to infections that a normal immune system would handle easily.
Key implications:
• Infections may present atypically — the usual signs of infection (fever, redness, swelling) are dampened by the anti-inflammatory effect. A patient on steroids may have a serious infection with minimal symptoms.
• Opportunistic infections — organisms that are normally harmless can cause disease. Pneumocystis pneumonia (PCP), invasive fungal infections, and reactivation of latent tuberculosis are risks in long-term steroid users.
• Wound infections may be silent
• Mask fever — steroids suppress the fever response
Nursing vigilance: A patient on steroids who is "just not feeling well" or has vague malaise deserves a thorough infection assessment — vital signs, labs, and careful physical exam. The classic signs of infection may be absent.
💊 "Steroids hide infection." A patient on prednisone 40mg daily develops appendicitis. Instead of the classic fever, elevated WBC, and rebound tenderness — they have mild discomfort and a normal temperature. The surgeon who doesn't know about the steroids may dismiss the presentation. The nurse must always document and communicate steroid use.
N — Necrosis (avascular necrosis)
Bone blood supply is interrupted — bone dies from the inside
Avascular necrosis (AVN, also called osteonecrosis) is one of the most serious and disabling complications of corticosteroid use. Steroids interfere with blood supply to bone — particularly the femoral head (hip joint), humeral head (shoulder), and knee. Without blood supply, bone tissue dies and collapses.
The clinical picture: A patient on long-term steroids develops progressive hip pain, eventually requiring total hip replacement. The pain is often insidious, starting as mild joint pain that worsens over months before the diagnosis is made on MRI.
Who is at risk: High-dose steroids (prednisone above 20mg daily), prolonged duration, prior history of AVN. Most common sites: femoral head, humeral head, femoral condyle (knee).
Nursing education: Patients on long-term high-dose steroids should report any new or worsening joint pain — particularly hip pain — to their provider promptly.
G — Growth suppression
Children on steroids may not reach their full height
Corticosteroids suppress growth hormone and IGF-1 (insulin-like growth factor 1) — two hormones essential for linear bone growth in children. Long-term systemic steroid use in children can permanently impair growth and result in shorter final height than genetically expected.
Clinical relevance: Children with asthma, Crohn disease, or nephrotic syndrome who require long-term steroid therapy are closely monitored for growth velocity. Inhaled steroids have a lesser effect than systemic steroids — but even inhaled steroids at high doses affect growth.
Osteoporosis: In adults, steroids do not suppress growth but DO cause bone loss — decreasing calcium absorption and increasing bone resorption. Long-term steroid users require calcium and Vitamin D supplementation, and bisphosphonates (alendronate) may be prescribed to protect bone density.
💊 Patients starting long-term steroids should also start calcium 1000–1500mg daily and Vitamin D 800–1000 IU daily for bone protection. A DEXA scan (bone density test) should be considered as a baseline. This preventive care is often ordered alongside the steroid — the nurse verifies both are in place.
S — Sugar increase (Steroid-induced hyperglycemia)
Steroids raise blood glucose — causing or worsening diabetes
Corticosteroids raise blood glucose through multiple mechanisms: increasing hepatic glucose production, causing peripheral insulin resistance, and impairing insulin secretion. In patients without diabetes, this causes transient hyperglycemia. In patients with diabetes, it can cause significant, difficult-to-control blood sugar elevations.
Steroid-induced diabetes: Some patients without prior diabetes develop persistent hyperglycemia on steroids that requires insulin or oral diabetes medications. This may or may not resolve when steroids are tapered.
The morning pattern: Many steroids are given in the morning (to mimic the body's natural cortisol peak). Blood glucose peaks several hours after the morning steroid dose — typically mid-to-late afternoon. Insulin regimens for steroid-induced diabetes are adjusted for this pattern (not the typical before-meals dosing).
Nursing action: Blood glucose monitoring should be ordered for any patient starting systemic steroids — even patients without a prior diabetes history. Report glucose above 180 mg/dL to the provider.
💊 "Steroids after breakfast, glucose spikes after lunch." A patient who receives prednisone at 8am will have their peak glucose elevation around noon to 2pm. The nurse who checks glucose before breakfast (7am) may see a normal result — and miss the steroid-induced spike happening 6 hours later. Glucose timing should account for steroid administration timing.
Critical Safety Rule
Never stop steroids abruptly — adrenal suppression and crisis
When a patient takes exogenous (external) corticosteroids for more than 1–2 weeks, the adrenal glands receive a signal that enough cortisol is present and slow or stop their own production. If the steroids are abruptly discontinued, the adrenal glands cannot produce enough cortisol quickly enough to meet the body's needs — resulting in acute adrenal insufficiency (adrenal crisis).
Adrenal crisis: Profound hypotension, severe weakness, nausea, vomiting, abdominal pain, fever, and altered mental status — a life-threatening emergency requiring immediate IV hydrocortisone. The treatment is giving back the cortisol the adrenal glands cannot produce.
The taper: Steroids are always tapered when stopping long-term therapy — the dose is gradually decreased over weeks to months, giving the adrenal glands time to wake up and resume production. The longer the course and the higher the dose, the longer and more gradual the taper required.
🏥 Clinical Scenario — Managing a Patient on Long-Term Steroids
Mrs. Nakamura, 52 years old, has systemic lupus erythematosus (SLE) and has been on prednisone 30mg daily for 8 months. She is admitted for evaluation of increasing fatigue and joint pain. You are completing the admission assessment.
C+S
Cataracts and Skin: She reports blurry vision in her right eye — notes it has been worsening for 2 months. Skin assessment reveals multiple bruises on arms from minor bumps, thin fragile skin that tore at a previous IV site. Ophthalmology referral recommended for posterior subcapsular cataracts screening.
H+S
Hypertension and Sugar: BP 158/96 (elevated — was 118/74 before steroid therapy). Glucose 214 (patient had fasting labs — elevated at rest). She was not previously diabetic. Endocrinology consulted for steroid-induced hyperglycemia. Antihypertensive added. Low-sodium diet ordered. Potassium 3.2 — supplementation started.
I
Immunosuppression assessment: She mentions "I've had three colds this winter that lasted weeks each time." Temperature today 37.0 (normal) but WBC 11.2 (borderline elevated). Urine dipstick positive for nitrites and leukocyte esterase — possible UTI. Steroids may be masking a more significant infection. Culture ordered. Antibiotics started empirically pending culture results.
N+G
Necrosis and Growth/Bone: She reports right hip pain for 4 months — initially attributed to lupus. MRI ordered to evaluate for avascular necrosis of the femoral head. DEXA scan reviewed — osteopenia confirmed. Calcium 1200mg and Vitamin D 1000 IU confirmed in orders. Bisphosphonate initiated after provider review.
📌 NCLEX Application
CUSHINGS on NCLEX appears in side effect recognition, patient teaching, and safety questions:
Side effect identification: "A patient on long-term prednisone develops new onset hypertension, weight gain, and blood glucose of 224. What does the nurse recognize?" → These are expected corticosteroid side effects — H (hypertension) and S (sugar increase) from CUSHINGS.
Abrupt discontinuation: "A patient on prednisone 40mg daily for 6 months asks if they can just stop taking it since they feel better. What does the nurse tell them?" → Never stop steroids abruptly — this can cause adrenal crisis. The dose must be tapered gradually under provider supervision.
Infection masking: "A patient on dexamethasone develops a post-operative wound infection. Which finding is the nurse most likely to observe?" → Minimal signs of infection — steroids suppress fever and inflammatory response. Wound drainage or subtle changes may be the only clue. Temperature may be normal even with serious infection.
GI protection: "Which instruction does the nurse include for a patient starting prednisone?" → Take with food to reduce GI irritation. Report any epigastric pain, dark stools, or blood in vomit — signs of peptic ulcer or GI bleed.
⚠️ The Trap — Normal Temperature in a Seriously Infected Steroid Patient
A patient on high-dose prednisone develops pneumonia. On assessment, the nurse notes: temperature 37.2°C (normal), HR 88, RR 18, subtle decreased breath sounds at the right base. The nurse reassures the patient that "there is no fever, so it is probably not serious."
What is wrong: Corticosteroids suppress the fever response by blocking prostaglandin synthesis — the same mechanism that causes GI ulcers. A patient on steroids may have a serious, even life-threatening infection with a normal or only slightly elevated temperature.
The true assessment: In immunosuppressed patients, lack of fever does NOT mean lack of infection. Subtle clinical findings — decreased breath sounds, increased respiratory rate, mild leukocytosis, malaise, a wound that looks "just a little off" — can be the only signs of serious infection that would cause a 39°C fever in an immunocompetent patient.
The standard: Any new or changed symptom in a patient on steroids deserves a full infection workup — not reassurance based on a normal temperature. Report subtle changes promptly.