How long can COVID brain fog last?

Brain fog can involve slower thinking, forgetfulness, difficulty finding words, poor concentration, or feeling mentally drained. During or after COVID-19, it may fluctuate with exertion, poor sleep, stress, pain, or another illness. Some people improve as recovery progresses; others have symptoms that continue and fit a broader pattern of Long COVID. Brain fog is not a diagnosis by itself. Insomnia, sleep apnoea, depression, anxiety, burnout, and iron deficiency anaemia can also affect attention and memory.

Keep a simple record of concentration, sleep, activity, medicines, and symptom changes. Break demanding tasks into short periods, reduce distractions, and schedule rests before exhaustion arrives. Use written reminders, calendars, and one task at a time. Return to work, study, driving, and other safety-sensitive activities gradually; do not drive if attention is unreliable. Regular meals, fluids, and a consistent sleep routine can support recovery. A clinician can review medicines and decide whether tests or rehabilitation advice are appropriate.

Get urgent help for sudden confusion, new weakness or numbness on one side, trouble speaking, a seizure, collapse, or a severe sudden headache. Arrange a clinical review when brain fog persists, interferes with work or daily tasks, is worsening, or occurs with marked sleepiness, low mood, breathlessness, or headaches. Ask for a review sooner if memory problems create safety concerns.

Could sleep, mood, anaemia, medicines, or another condition be contributing? How should I pace work or study? Do I need tests or referral? Which activities are unsafe while concentration is reduced?