Fatigue and irritability: what to know

Poor or interrupted sleep can reduce concentration and make ordinary frustrations harder to manage. Burnout may follow prolonged work or caring demands, with emotional exhaustion and reduced recovery. Anxiety can keep the body alert, while depression may bring low mood, loss of interest, slowed thinking or changes in sleep and appetite. Insomnia is a possible driver when difficulty falling asleep or staying asleep becomes a pattern. Hypoglycaemia can cause irritability with sweating, shaking, hunger, dizziness or confusion, particularly in people using glucose-lowering treatment. These patterns can overlap.

Keep a short diary of sleep, meals, caffeine, alcohol, stress, mood and the times fatigue or irritability peak. Aim for consistent sleep and wake times, regular meals, daylight and gentle activity that does not worsen exhaustion. Take prescribed medicines as directed and do not change them without advice. If symptoms affect work, relationships or self-care, arrange a clinical review; talking therapy or a sleep-focused plan may be considered when appropriate.

Seek urgent help for thoughts of self-harm, inability to stay safe, severe confusion, collapse or symptoms of low blood sugar that do not improve promptly. Arrange medical care when fatigue and irritability persist, worsen, follow a medicine change, or occur with substantial weight, sleep, mood or appetite changes. Ask someone you trust to support you if reaching out feels difficult.

Could sleep, mood, anxiety, blood sugar, medicines or another physical condition be contributing? What symptoms should I track before follow-up? Would a sleep plan, mental-health support or blood tests be useful?