The reason why your left eye is swollen for no reason may be blepharitis, conjunctivitis, heart and kidney disease, and so on.
1. Blepharitis: mainly caused by staphylococcal infection, which may lead to dilation of capillaries or small veins in the left eye area, thus leading to symptoms of swelling; it may also be due to the stimulation of inflammatory factors that lead to the exudation of local tissue fluids, stagnation in the soft tissues of the eye, thus leading to the symptom of eye swelling.
2. Conjunctivitis: Conjunctivitis may be caused by bacterial infection, viral infection, allergy, etc., which leads to symptoms of eye swelling.
3. Cardiac and renal diseases: some patients with cardiac insufficiency and renal diseases may have swollen eyes, and they should consult a doctor in time for diagnosis.
If there is no reason for the symptoms of swelling of the left eye, you should consult a doctor in time, and the cause of the disease after treatment.