Headache on the left side of the head and eye

Migraine may cause one-sided throbbing pain with nausea or sensitivity to light and sound, sometimes with discomfort around one eye. Eye strain can follow prolonged reading, screens, glare, or an uncorrected vision problem and may feel worse after focusing. Nasal blockage, facial pressure, or discharge can occur with Allergic Rhinitis, Chronic Sinusitis, or a cold. Pain with a red eye, blurred vision, halos, marked light sensitivity, swelling, or pain when moving the eye needs prompt assessment because an eye problem can require treatment. The location alone cannot identify the cause.

Pause close-up work, lower screen brightness, and rest in a quiet room. Avoid rubbing the eye, and remove contact lenses if they are irritating; use glasses while symptoms settle. Drink fluids and keep a note of vision changes, redness, tearing, nausea, light sensitivity, triggers, and timing. A pharmacist can advise about suitable pain relief for your medical history. Arrange a clinician or optometrist review if the pain recurs, follows screen use repeatedly, or comes with eye discomfort even when vision seems normal.

Seek emergency care for sudden severe pain with vision loss, a new drooping eyelid, unequal pupils, weakness, numbness, confusion, trouble speaking, or collapse. Obtain urgent eye assessment for a painful red eye, sudden blurred vision, halos, significant swelling, or pain after an eye injury or chemical exposure. Fever with severe headache and a stiff neck also requires emergency attention.

Should my eye pressure, vision, or eye movements be checked? Could migraine or sinus symptoms explain this pattern? Are contact lenses, screens, or glasses contributing? Which changes mean I should go straight to emergency care?