Age is 80 when he sits his nose start with white fluid and when he lay mucus after every half an hous

Professional Clinical Assessment: Differential diagnoses primarily include chronic rhinitis, postnasal drip syndrome, or cerebrospinal fluid (CSF) leak - with positional rhinorrhea being a key symptom requiring careful evaluation in this elderly patient. The pathophysiological mechanism likely involves either inflammatory changes of the nasal mucosa, autonomic dysfunction common in elderly patients, or potential CSF rhinorrhea which requires urgent evaluation given the patient's advanced age and increased risk of intracranial complications. Given the patient's age of 80, specific risk factors include age-related decreased mucociliary clearance, potential anatomical changes, history of head trauma, and increased likelihood of medication side effects (particularly from antihypertensives or other commonly prescribed medications in elderly patients). Additional testing should include: - Beta-2 transferrin testing of the nasal fluid to rule out CSF leak - Nasal endoscopy - CT scan of paranasal sinuses - Basic metabolic panel and inflammatory markers to assess underlying causes

For nasal discharge and postural mucus symptoms at age 80, use a saline nasal spray 2-3 times daily to help thin secretions and clear nasal passages, combined with elevating the head while sleeping using an extra pillow to reduce mucus accumulation. Additionally, take an over-the-counter antihistamine like Cetirizine (10mg daily) to reduce secretions, and run a humidifier in the bedroom at night to keep nasal passages moist and help prevent irritation. For additional treatment recommendations, ask in the chat.