Body aches and diarrhoea but no fever: what to know

Diarrhoea removes fluid and salts from the body, which can leave muscles sore, weak, or crampy. A viral illness may cause digestive symptoms and aches without a measurable fever. Food-related irritation, medication side effects, and less commonly illnesses such as COVID-19, influenza, malaria, or dengue fever can also be considered from the wider history. The symptom pattern alone cannot identify a cause.

Take frequent small sips of water or an oral rehydration drink. Choose simple foods when you feel able, and avoid alcohol and foods that clearly worsen the diarrhoea. Rest, wash your hands carefully, and avoid preparing food for others while symptoms continue. Record how often you pass stool, whether there is blood, and any recent travel, unusual food, or new medicine. A pharmacist or clinician can advise whether an anti-diarrhoeal medicine is suitable for you.

Seek urgent help for confusion, fainting, severe weakness, trouble breathing, severe abdominal pain, bloody or black stools, or inability to keep fluids down. Arrange prompt medical advice if urination becomes unusually low or dark, diarrhoea continues, or aches are worsening. People who are pregnant, older, immunocompromised, or living with significant kidney or heart disease should seek advice earlier.

Ask whether your symptoms suggest dehydration, whether testing is needed, which fluids are appropriate, and which warning signs should prompt same-day review.