Sore throat, diarrhoea and fatigue

Viruses can affect the throat and digestive system together, causing loose stools, reduced appetite, and tiredness. COVID-19, Influenza, and Glandular Fever can have overlapping symptoms, although each person's pattern varies. Strep Throat and Tonsillitis mainly affect the throat but may make eating and drinking difficult. Acid Reflux or Allergic Rhinitis can irritate the throat, but they do not usually explain diarrhoea, so another illness or medicine effect may be involved. Symptoms alone cannot identify the cause.

Take frequent small sips of water or an oral rehydration drink. If diarrhoea is active, replace fluids after each episode and choose simple foods as appetite returns. Rest, wash hands carefully, and avoid preparing food for others while unwell. Check with a pharmacist before taking anti-diarrhoeal medicine, especially for a child, during pregnancy, or if there is fever or blood in the stool. Do not start antibiotics without medical advice.

Get urgent help for confusion, fainting, severe weakness, breathing difficulty, inability to swallow fluids, or signs of serious dehydration such as very little urine. Seek prompt advice for blood or black stool, severe abdominal pain, repeated vomiting, or symptoms that keep worsening. Arrange review if diarrhoea or fatigue persists, or if you have a condition that makes dehydration more risky.

Could a virus, medicine, or another condition explain these symptoms? How much should I drink, and do I need oral rehydration? Should I be tested for COVID-19 or another infection? Which warning signs matter most for me?