There are many reasons for bloodshot and watery eyes, which may be related to visual fatigue, inverted eyelashes, conjunctivitis, and so on. 1. Visual fatigue: If patients read for a long time or wear inappropriate glasses, it can cause visual fatigue, resulting in conjunctival congestion, tearing and other symptoms. 2. Inverted eyelashes: Inverted eyelashes can cause conjunctival congestion and tearing because of the abnormal growth direction of the eyelashes, which can irritate the surface tissues of the eyes. 3. Conjunctivitis: under the stimulation of inflammation, patients with conjunctivitis may experience discomfort such as conjunctival congestion, photophobia, tearing, etc., which may also be accompanied by an increase in ocular secretion. It is recommended that patients with obvious symptoms of congestion and tearing of the eyes should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.