Headache at the back of the head on the left side

Pain near the left occiput can follow prolonged screen use, an awkward sleeping position, jaw clenching, or tight muscles in the neck and shoulders. Migraine can be one-sided and may bring nausea or sensitivity to light and sound, even when pain is felt toward the back. Brief electric or stabbing jolts may suggest irritation of an occipital nerve. Fever, blocked or runny nose, cough, vomiting, sweating, or poor fluid intake can point toward an illness or fluid loss; related information includes [Dehydration](/conditions/dehydration/) and [Chronic Sinusitis](/conditions/chronic-sinusitis/). The location alone cannot identify the cause.

Record when the pain began, how long each episode lasts, its severity, and whether movement, coughing, posture, meals, sleep, or light changes it. Rest in a quiet room, drink fluids gradually, eat if you have missed a meal, and use a cool or warm pack according to which feels more soothing. Gentle neck movement may help muscular discomfort, but stop if it increases pain. Use any over-the-counter pain medicine only as directed on its label and check with a pharmacist if you are pregnant, have another illness, or take regular medicines. A clinician can assess a new, recurring, or changing pattern.

Seek emergency help for a sudden, severe headache, fainting, confusion, a seizure, new weakness or numbness, trouble speaking, vision loss, a stiff neck with fever, or repeated vomiting. Arrange prompt medical assessment after a head injury, or if the headache is worsening, keeps returning, wakes you, or comes with fever or a painful scalp. Do not use the location on the left side to judge seriousness; new neurological symptoms need urgent assessment.

Could my neck, jaw, migraine pattern, medicines, or blood pressure be contributing? What warning signs should I watch for? Should I keep a headache diary, and how often is it safe for me to use pain relief?