Insufficient tear secretion in young people may be caused by staying up late, congenital absence of lacrimal gland and facial paralysis. 1. Staying up late: young people have the bad habit of staying up late for a long time, which leads to overuse of the eyes and can cause insufficient tear secretion, and the patient may have symptoms such as dry eyes and few tears. 2. Congenital absence of lacrimal gland: if the patient is born with underdeveloped or missing lacrimal gland, which destroys the function of lacrimal gland secretion, leading to hyposecretion of lacrimal gland and symptoms of insufficient lacrimal secretion, which in turn leads to dry eyes. 3. Facial paralysis: If the facial nerves innervating the lacrimal glands are paralyzed, blocking the tear reflex, the patient may also experience symptoms of insufficient tear secretion. It is recommended that patients with significant dryness of the ocular surface should seek prompt medical attention to assess their condition and treat them under the guidance of a doctor.