Our Symptom checker provides clinical advice on what to do next based on your symptoms.
Fatigue, when you always feel exhausted even if you are well rested, could be a symptom of something that is wrong. You may need to see your doctor.
Chronic fatigue syndrome (CFS)
Trusted information on chronic fatigue syndrome (CFS), also known as Myalgic Encephalitis (ME), for which there is no simple cause or cure, including symptoms, and how it is managed.
Trusted information about adrenal fatigue, which is not an official diagnosis, as well as causes and ways of managing fatigue in general.
Self-help tips to fight mild fatigue
Trusted information and tips on fighting fatigue including eating and drinking, getting more exercise and sleep, reducing stress, and losing weight.
Glandular fever symptoms
Glandular fever (also called the ‘kissing disease’) is an infectious disease which is common in teenagers and young adults. Find out more about the symptoms of glandular fever.
Iron deficiency symptoms
People who have an iron deficiency can often feel tired, dizzy or short of breath. Find out more about common iron deficiency symptoms by reading our trusted partner pages.
Symptoms of heart failure
There are a number of symptoms associated with heart failure. Find out more from the information and resources on this page.
Losing interest in things you once enjoyed could be a sign that you’re depressed. Learn some tips to motivate yourself and get back on track.
Leukaemia symptoms are often mild at first, but slowly worsen over time. Find out more about common and uncommon symptoms of leukaemia, plus links to trusted resources.
Jet lag is a combination of fatigue and other symptoms caused by travelling across different time zones.
Spasms in the eyelid (A ‘twitching eye’ or an ‘eye twitch’) can signal fatigue, stress and in rare cases, multiple sclerosis. Learn about its causes, treatments and when to see a doctor.