Head swelling and pain when bowing down may be related to increased blood pressure, cervical spondylosis, sinusitis and so on. 1. Unstable blood pressure: Irregular work and rest, often late at night, emotional instability and other factors may lead to increased blood pressure. When you lower your head, the increase in blood pressure is more pronounced, resulting in head swelling and pain. 2. Cervical spondylosis: when suffering from cervical spondylosis, the head and neck muscles continue to contract when the head is bowed down, while cervical spondylosis may compress the nerves and vertebral arteries, which may lead to head swelling and pain. 3. Sinusitis: Sinus infections caused by viruses, bacteria, and fungi are called sinusitis, and sinusitis leads to an inflammatory response in the sinuses. When the body’s position changes when the head is bowed, the inflammatory reaction in the nasal cavity may stimulate the nerves in the head, resulting in the symptom of headache when the head is bowed. When the symptoms of head swelling and pain when bowing down appear, patients should promptly seek medical treatment by a professional doctor for a clear diagnosis and treatment.