Steroid-Induced Conditions (Corticosteroid Side Effects)

Why steroids cause side effects

Corticosteroid medicines mimic cortisol, a natural hormone that regulates metabolism, immunity, blood pressure and stress responses. Doses used for treatment are usually much higher than the body's own production, so they affect many organs. Risk depends on the dose, duration, route (tablets and injections more than inhaled or topical) and individual factors such as age and existing diabetes.

Common steroid-induced conditions

When features such as moon face, central weight gain, stretch marks and muscle weakness appear together, the condition is called iatrogenic Cushing syndrome.

Adrenal suppression and steroid withdrawal

Taking steroids for more than about 3 to 4 weeks can switch off the body's own cortisol production. If steroids are stopped suddenly, or the body faces a major stress such as surgery, injury or serious illness, the adrenal glands may not respond. This can cause:

• tiredness, weakness, aches and low mood (steroid withdrawal symptoms)
• nausea, vomiting, low blood pressure and collapse (adrenal crisis), which is life-threatening

Key safety points:

• never stop long-term steroids suddenly. Your doctor will taper the dose
• carry a steroid emergency card or medical ID
• follow sick-day rules for extra doses during illness if advised
• tell surgeons and anesthetists that you take steroids

Inhaled, nasal and topical steroids

These deliver medicine where it is needed with much lower body exposure:

• inhaled steroids: hoarse voice and oral thrush. Rinse your mouth after use. High doses over years can affect bones and eyes
• nasal steroids: nosebleeds and dryness
• topical steroids: thinning skin, stretch marks and acne-like rashes with strong creams used long term, especially on the face. Topical steroid withdrawal can cause red, burning skin after prolonged use

Reducing the risks

• use the lowest effective dose for the shortest time, with steroid-sparing medicines where possible
• take daily doses in the morning to match natural cortisol rhythm and reduce insomnia
• bone protection: calcium, vitamin D, weight-bearing exercise, bone density scans and often bisphosphonates for people at risk
• monitor blood sugar, especially if you have diabetes or prediabetes
• blood pressure checks
• eye examinations for long-term users
• vaccinations, including flu, pneumococcal, COVID-19 and shingles, ideally before high-dose treatment
• stomach protection if also taking NSAIDs or with ulcer history
• a healthy diet low in salt and sugar to limit weight gain and fluid retention

Outlook

Many side effects, such as weight gain, mood changes, high blood sugar and skin effects, improve after the dose is reduced or stopped. Others, such as cataracts, fractures and avascular necrosis, can be permanent, so prevention and early detection matter. The benefits of steroids often outweigh the risks for serious conditions.

Frequently asked questions

What are the most common side effects of long-term steroids?

Common side effects include weight gain, increased appetite, high blood sugar, insomnia, mood changes, thin skin and easy bruising. With longer use, osteoporosis, cataracts, glaucoma, infections, muscle weakness and adrenal suppression become more likely.

Can steroids cause diabetes?

Yes. Steroids raise blood sugar by making the body less sensitive to insulin and increasing glucose production by the liver. This is called steroid-induced diabetes. It often improves when the dose is reduced or stopped, but people with risk factors may develop lasting diabetes.

Why can't you stop steroids suddenly?

Long-term steroid use suppresses the body's own cortisol production. Stopping suddenly can leave the body without enough cortisol, causing weakness, vomiting, low blood pressure and potentially a life-threatening adrenal crisis. Doses are tapered gradually under medical supervision.

Do inhaled steroids have the same side effects?

No. Inhaled steroids deliver much smaller amounts to the rest of the body and are much safer than tablets. Common side effects are hoarseness and oral thrush, which can be reduced by rinsing the mouth after each use. Very high doses over years can have some body-wide effects.

How can I protect my bones while taking steroids?

Get enough calcium and vitamin D, do weight-bearing exercise, avoid smoking and excess alcohol, and ask your doctor about a bone density scan. Many people on long-term steroids are advised to take bone-protecting medicines such as bisphosphonates.