What should you know about tired and headache?

A headache may occur with a common cold, COVID-19, allergic rhinitis, or chronic sinusitis when congestion and inflammation affect the nose and nearby spaces. Dehydration and heat exhaustion can cause headache with thirst, dark urine, dizziness, weakness, nausea, or heavy sweating. Anxiety and poor sleep can tighten head and neck muscles and leave you drained. Dengue fever is another possibility in some settings, particularly when fever, marked body aches, nausea, or a rash are present. The symptom pair does not identify one condition by itself.

Rest in a cool, quiet place, drink fluids gradually, eat if you have missed meals, and reduce bright screens while symptoms settle. Record when the headache began, where it is felt, its severity, fever, congestion, heat exposure, and any medicine taken. Use medicines only as directed on the label or by a clinician, and ask a pharmacist if pregnancy, chronic illness, or other medicines affect your choices. Arrange review if headaches recur or do not settle.

Seek emergency help for a sudden severe headache, new weakness or numbness, confusion, fainting, seizure, stiff neck with fever, trouble speaking, vision loss, or repeated vomiting. After heat exposure, urgent assessment is needed for confusion, collapse, inability to drink, or worsening weakness. Prompt medical advice is appropriate for a persistent fever, rash, bleeding, severe eye pain, or a headache that is new and progressively worsening.

Could congestion, dehydration, heat, infection, stress, or a medicine explain this pattern? Do I need an examination or testing? Which changes in the headache should prompt urgent care?