Throbbing headache on the left side

Migraine often causes pulsing pain on one side and may come with nausea or sensitivity to light and sound. Tension in the scalp, jaw, neck, or shoulders can also create pain that feels rhythmic. Nasal blockage or facial pressure may occur with a cold, allergic rhinitis, or sinus problems. Not eating regularly, sweating in heat, poor fluid intake, alcohol, disrupted sleep, and prolonged screen use can add to headache discomfort. A symptom diary can help show whether attacks follow a trigger, how long they last, and whether activity makes them worse.

Rest in a quiet, dim room and drink fluids slowly. If you have missed a meal, choose a light snack. Gentle neck and shoulder movement may help when muscle tension is present; stop if it increases pain. Follow the label directions for any over-the-counter pain medicine and avoid taking it more often than advised. Record the start time, location, severity, triggers, associated symptoms, and medicines used. Repeated headaches, a new pattern, or headaches that interfere with work or sleep deserve a primary-care review.

Seek emergency help for a sudden, severe headache, or headache with weakness, facial drooping, confusion, fainting, trouble speaking, a stiff neck, repeated vomiting, seizure, or new vision loss. Arrange prompt assessment after a head injury, during pregnancy, or when a headache comes with high fever or a painful red eye. Contact a clinician soon if the pain keeps returning, steadily worsens, changes from your usual pattern, or does not settle with reasonable self-care.

Ask whether the pattern fits migraine or another headache type, whether an examination is needed, and which treatments are suitable for you. Mention recent illness, heat exposure, fluid intake, sleep changes, medicines, eyesight symptoms, nausea, and any family history of migraine.