Thyroid eye disease is an autoimmune condition in which the eye muscles and tissues behind the eyes become inflamed, and as a result, they protrude. People living with this condition have red and swollen eyes and eyelids. A delay in addressing and managing the condition can cause varying degrees of vision impairment. For a timely diagnosis, knowing how the condition manifests is essential. On that note, here are a few details about thyroid eye disease. Symptoms of thyroid eye disease Here are some of a few symptoms that can help healthcare professionals diagnose the condition in their patients: 1. Prominent bags under the eyes One of the most noticeable indicators of thyroid eye disease is darkened lumps or “bags” under the eyes. While this may also be caused by a lack of sleep, they are more likely to be indicative of thyroid eye disease, especially if they are noticeable for an extended period of time. Undereye bags can also cause eye pain. This pain is particularly felt when one moves the eyes. 2. Red and watery eyes Inflammation of the eyes and the optic region is another symptom of thyroid eye disease. The inflammation is quite evident, and the pain caused by it can be felt behind the eyes and around them.