Chills and fatigue

Fatigue is more than ordinary sleepiness: it can make concentration, movement, and daily tasks harder. Chills may accompany an infection, while fatigue can remain during recovery. Anaemia, dehydration, coeliac disease, chronic kidney disease, COVID-19, or alcohol use disorder may also cause low energy with feeling cold or shivery. Burnout and chronic fatigue syndrome have different patterns and should not be assumed from a single episode. Consider sleep, eating, fluid intake, bleeding, medicines, mood, and symptom duration.

Keep a simple record of sleep, meals, fluids, activity, chills, temperature, and any dizziness or breathlessness. Pace activities, take regular nourishing meals, drink to thirst, and avoid using excess caffeine to push through exhaustion. Arrange a routine appointment when fatigue affects work, care, or usual activities, or when it keeps returning. A clinician can review medicines and decide whether examination or blood tests are useful.

Seek urgent help for chest pain, severe breathlessness, fainting, confusion, new weakness on one side, or inability to stay awake. Get prompt assessment for worsening chills, a new fever, unexplained bleeding, marked paleness, persistent vomiting, very little urine, or rapid decline. Dehydration can become serious when fluids are not replaced, particularly with vomiting or diarrhoea.

Could anaemia, dehydration, infection, thyroid disease, or kidney problems fit my pattern? Should my medicines, sleep, diet, or recent illness be reviewed? What changes should trigger earlier care?