Malaria

Malaria is a serious infection caused by a parasite spread by mosquito bites. It is found in many tropical and subtropical countries in Africa, Asia and South America. Symptoms usually appear 1 to 4 weeks after being bitten, but can start up to a year later. Without quick treatment, it can be life-threatening.

Last updated Nov 9, 2026

What it is

It is treated with antimalarial medicines, often in hospital.

Antimalarial tablets, insect repellent, covering skin and sleeping under a mosquito net greatly reduce the risk when travelling.

Common signs

  • High temperature, sweats and chills
  • Headache
  • Feeling sick and vomiting
  • Muscle pain
  • Diarrhoea
  • Yellow skin or eyes

How it is usually diagnosed

  • Blood tests (blood film and rapid tests), sometimes repeated

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Blood test results
  • Travel history and antimalarial tablets taken
  • Hospital discharge letters

Questions to ask your doctor

  • Which antimalarial tablets do I need for my trip?
  • How long should I take them after I return?
  • Could symptoms come back?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Fever after travel to a malaria area, especially with confusion, drowsiness or breathing problems: get urgent medical help the same day

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources