Tension Headache: This is often the most common cause of morning headaches, typically characterized by a dull, aching sensation, and can be related to stress, poor sleep, or muscle tension.

Migraine: Migraines can occur at any time, including in the morning, and are known for their high intensity. They can be accompanied by other symptoms such as nausea, vomiting, and sensitivity to light and sound.
Sleep Apnea: This condition involves pauses in breathing during sleep, leading to poor sleep quality and potentially causing morning headaches due to the lack of oxygen and increased pressure in the head.
Hypertension: High blood pressure can cause headaches, especially in the morning, due to the increased pressure on blood vessels in the brain.

Subarachnoid Hemorrhage: Although rare, this condition involves bleeding into the space surrounding the brain and can cause a sudden, severe headache, often described as "the worst headache" of one's life. It is crucial to diagnose promptly due to its high mortality rate.
Brain Tumor: A tumor in the brain can cause increased intracranial pressure, leading to morning headaches. Early detection is critical for effective treatment.
Temporal Arteritis: This condition involves inflammation of the blood vessels in the head, leading to severe headaches, and if untreated, can cause blindness.

Idiopathic Intracranial Hypertension (IIH): Characterized by increased pressure within the skull without any apparent cause, IIH can lead to morning headaches and vision changes.
Chiari Malformation: A structural defect in the cerebellum that controls balance, Chiari malformation can cause headaches, especially after sleeping, due to the compression of the cerebellum and brainstem.
Trigeminal Neuralgia: A chronic pain condition that affects the trigeminal nerve, which carries sensation from your face to your brain, causing intense shock-like or stabbing pain in parts of your face, potentially leading to morning headaches if the pain occurs during sleep.