A headache often occurs with other symptoms. These symptoms can provide an important clue to the underlying cause.

Symptoms that occur with headaches include:

• Change in vision:
• Blurry vision
• Sensitivity to bright light
• Sensitivity to loud noise
• Dizziness
• Ear pain
• Nausea
• Vomiting
• Fever
• Neck pain
• Neck stiffness

Serious symptoms that occur with headaches include:

• Confusion
• Difficulty speaking
• Difficulty walking
• Severe eye pain
• Facial numbness (unilateral)
• Facial weakness
• Arm numbness (unilateral)
• Arm weakness (unilateral)
• Leg numbness (unilateral)
• Leg weakness (unilateral)
• Poor coordination
• Poor balance
• Lethargy:
• Excessive sleepiness
• Fainting
• Seizure

Symptoms of less serious conditions that cause headaches include:

• Cluster headaches symptoms
• Dehydration symptoms
• Hangover symptoms
• Migraine headache symptoms
• Sinusitis symptoms
• Anxiety disorder symptoms
• TMJ disease symptoms

Symptoms of serious conditions that cause headaches include:

• Subarachnoid hemorrhage symptoms
• Brain tumor symptoms
• Encephalitis symptoms
• Meningitis symptoms
• Epidural hematoma symptoms
• Acute glaucoma symptoms
• Head injury symptoms
• Heatstroke symptoms
• Hydrocephalus symptoms
• Mastoiditis symptoms
• Malignant hypertension symptoms
• Stroke symptoms
• Subdural hematoma symptoms
• Temporal arteritis symptoms