What should you know about shingles and Crohn's disease?

Shingles is a painful rash caused by reactivation of the chickenpox virus. Crohn's disease affects the digestive tract and may be treated with medicines that dampen immune activity. That treatment does not prove shingles is present, but it can make a new blistering rash, burning skin pain, fever, or unusual tiredness worth discussing promptly. Shingles may occur on one side of the body; it does not typically explain ongoing abdominal pain or diarrhoea, which may reflect Crohn's disease or another digestive problem.

Contact a GP or your gastroenterology team as soon as you notice a one-sided band of pain, tingling, or blisters. Early assessment can help decide whether antiviral treatment is appropriate. Keep the rash clean and covered, avoid scratching, and wash your hands after touching it. Avoid close skin contact with pregnant people, newborn babies, and anyone with a weakened immune system until the blisters have crusted. Do not stop Crohn's medicines on your own; ask the prescriber how to handle them while you are unwell.

Seek urgent medical help if the rash is near an eye or on the face, you develop vision changes, severe headache, confusion, weakness, breathing difficulty, or rapidly worsening illness. Contact a clinician urgently if you cannot keep fluids down, have severe abdominal pain, or notice a major change in bowel symptoms alongside the rash. These features need assessment for complications or a separate problem, rather than being attributed to shingles alone.

Ask whether your Crohn's treatment changes the urgency of assessment, whether any medicine should be paused, how to protect household contacts, and whether a blood test or examination is needed. Bring the date the rash or pain began and a list of current medicines.