Headache and red eyes: what to know

Redness may come from dry air, smoke, dust, prolonged screen use, contact lenses, or rubbing the eye. Headache can occur alongside a cold, allergic rhinitis, or sinus inflammation, especially when there is nasal blockage, sneezing, facial pressure, or discharge. Dehydration and heat exhaustion may also cause headache, thirst, weakness, dizziness, and eye discomfort.

Viral illnesses such as a common cold or COVID-19 can bring headache with feeling unwell, fever, cough, sore throat, or eye irritation. Dengue fever can cause a strong headache with fever, marked body aches, nausea, or pain behind the eyes; fever after mosquito exposure deserves medical advice. These symptoms do not identify one cause on their own.

A red eye with intense pain, reduced or blurred vision, halos around lights, marked light sensitivity, nausea, or a fixed-looking pupil can signal an eye emergency. A headache that begins abruptly, follows an injury, or occurs with weakness, confusion, fainting, or difficulty speaking also needs urgent care.

Rest in a cool, dim room and take regular fluids if you can drink normally. A cool clean compress over closed eyelids may ease irritation. Avoid rubbing your eyes, smoke, bright light, and contact lenses until the redness settles. Do not use someone else’s eye drops or leftover antibiotic drops.

If you normally use an over-the-counter pain reliever safely, follow its package directions and avoid combining products with the same ingredient. Check with a pharmacist or clinician first if you are pregnant, have a long-term condition, take regular medicines, or have fever and possible dengue, because some pain medicines may be unsuitable. Arrange a clinical review if symptoms persist, recur, or do not improve after removing an obvious irritant.

Seek emergency care now for sudden or severe headache, severe eye pain, loss or change of vision, halos, significant light sensitivity, repeated vomiting, a swollen eye, or an eye injury or chemical splash. Seek urgent help as well for weakness, numbness, confusion, trouble speaking, fainting, a stiff neck, or a high fever with a new rash.

Remove contact lenses and obtain prompt assessment if redness is painful, vision is affected, or light hurts. If symptoms are mild but continue, or if one eye stays red, book a clinician or optometrist appointment so the eye surface, vision, and possible infection can be checked.

Ask: Could the redness be from the eye surface, an allergy, infection, or sinus symptoms? Do I need an eye examination or a vision check? Which pain reliever is suitable with my medicines and health conditions? What changes should prompt emergency care? Tell the clinician when the headache and redness began, whether one or both eyes are affected, any fever or discharge, contact-lens use, recent travel or mosquito exposure, and what you have already taken.