The patient’s eyes are not red or swollen but painful, which may be caused by overuse of eyes, uveitis and glaucoma. 1. Excessive eye use: As patients look at electronic products or work in close proximity for a long period of time, it can lead to continuous spasm of ciliary muscle, and the eyes do not get any rest, which can lead to pain and distension in the eyes although the eyes are not red or swollen. 2. Uveitis: due to the inflammation of the uveal tissue inside the patient’s eye, it can stimulate the local pain nerve fibers, which can lead to the patient’s eye pain, eye redness and swelling is not obvious. 3. Glaucoma: Glaucoma patients with elevated intraocular pressure, the patient may appear eye swelling and pain, nausea, vomiting, blurred vision and other uncomfortable symptoms, but the redness and swelling of the eyes is not obvious. It is recommended that patients with obvious eye pain should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.