What could a headache that worsens when lying down indicate?

A headache that worsens when lying down is commonly associated with increased intracranial pressure (ICP). This condition can be caused by various factors, such as tumors, hemorrhage, or infections, that disrupt normal cerebrospinal fluid dynamics or increase the volume within the cranial cavity. When a person lies down, the change in position can exacerbate the pressure against the brain, leading to intensified headache symptoms.

Increased ICP often presents with other signs, such as nausea, vomiting, visual changes, or altered mental status, as the increased pressure affects not just pain pathways but overall brain function too. Proper assessment and diagnosis are crucial, as management may involve addressing the underlying cause of the elevated pressure to relieve the headache and prevent further complications. Thus, identifying headaches that worsen in specific positions like lying down is critical for evaluating potential serious medical conditions.