A headache can have many causes. Recurring headaches, or a headache that is worsening or not improving, warrant professional assessment. A sudden extremely painful headache, or headache accompanied by weakness, a seizure, confusion or difficulty speaking, needs emergency assessment. This is a limited overview of headache guidance, not a symptom diagnosis or a complete emergency checklist. UK service names and telephone numbers in the original source are not Nigerian care pathways. Local escalation arrangements require separate review. A sudden worst-ever headache, new weakness, speech difficulty, seizures or confusion needs immediate emergency care. Ask someone nearby to help. Do not wait for a chat reply or home remedy. Record recurring headache patterns and arrange assessment if symptoms persist or worsen. This guide does not use UK telephone numbers as Nigerian referral advice or establish that a headache is safe.