3 doctors weighed in:

What causes headache in left side of head?

3 doctors weighed in
Dr. Maritza Baez
Family Medicine
2 doctors agree

In brief: Anything

Headaches can come from fatigue, sleeping too much or too little, eye strain, sleep apnea, snoring, being dehydrated, having chronic sinusitis or allergies, too much caffeine or over the counter headache medication, high blood pressure or something more serious like a tumor. See your doctor and get checked.

In brief: Anything

Headaches can come from fatigue, sleeping too much or too little, eye strain, sleep apnea, snoring, being dehydrated, having chronic sinusitis or allergies, too much caffeine or over the counter headache medication, high blood pressure or something more serious like a tumor. See your doctor and get checked.
Dr. Maritza Baez
Dr. Maritza Baez
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