Fatigue: causes, care and when to seek help

Fatigue is a persistent lack of energy or stamina that can affect thinking, mood and everyday activities.

It may feel different from wanting an earlier night. You might wake without feeling restored, need more effort for routine tasks, lose concentration, or feel physically heavy. Sleepiness can be part of fatigue, but some people feel exhausted while finding it hard to sleep.

Seek urgent medical help for fatigue with chest pain, severe trouble breathing, fainting, new confusion, coughing blood, or a sudden inability to do normal activities. Prompt assessment is also sensible when tiredness follows significant blood loss, comes with black stools, or occurs with swelling and breathlessness.

Fatigue can follow disrupted sleep, emotional strain, infection, reduced fluid intake, nutritional problems, medication effects, or an ongoing health condition. The possible causes listed here are alphabetical rather than a ranking. Depression, fibromyalgia, folate deficiency, generalised anxiety disorder, glandular fever, heart failure, hepatitis, HIV infection, hypothyroidism, influenza and insomnia can each include fatigue among their features.

A clinician will ask when the tiredness began, whether it is constant or fluctuates, how sleep is going, and which symptoms occur alongside it. They may review medicines, mood, diet, menstrual or bleeding history where relevant, and medical conditions. Examination and targeted blood or urine tests may be used when the history points to a physical contributor. Bringing a brief symptom and sleep record can make the consultation more focused.

Treatment depends on what is contributing. A sleep problem may need changes to sleep habits and a review of factors that interrupt rest. A deficiency may need dietary advice or replacement treatment, while infection, thyroid disease, heart problems or a mental health condition need condition-specific care. Do not start iron, vitamins, stimulants or herbal products solely to treat fatigue without checking whether they fit your situation and current medicines.

Regular meals, fluids, movement that suits your current ability, daylight exposure and a wind-down routine can support energy and sleep. Build activity gradually after illness rather than pushing through a marked crash. If work, caring responsibilities or worry are affecting rest, identify one practical adjustment, such as protecting a break or setting a consistent screen-free period before bed.

Tell a clinician about persistent fever, night sweats, unexplained bruising, pain, low mood, anxiety, loud snoring, morning headaches, numbness, thirst, frequent urination, or changes in appetite. These details do not diagnose a cause by themselves, but they guide the next questions and tests.

Long-lasting fatigue can narrow work, study, family and social life, and may make driving or safety-sensitive tasks harder. Early support can help protect routines while the cause is clarified. If exhaustion is affecting your ability to cope or you have thoughts of harming yourself, seek urgent mental health support.