The main differences between bile crystals and gallstones are etiology, morphology and symptoms. 1. Etiology: Bile crystals are mainly caused by an imbalance in the ratio of cholesterol to bile acids, etc. Bile crystals may develop into gallstones or bile polyps. Gallstones are mainly formed due to a combination of environmental, genetic and lifestyle factors. 2. Morphology: Bile crystals are mainly colorless, transparent squares, fixed and immobile attached to the gallbladder mucosa, and the morphology of bile crystals can be observed through ultrasound. Gallstones can be formed by the accumulation of bile crystals, which are mainly yellow, soft nodules that can move with body position. 3. Symptoms: Symptoms of gall crystals are not obvious, and some patients may experience mild discomfort such as bloating and indigestion. Patients with gallstones have no obvious symptoms, which may only be discovered during physical examination, and some patients may have recurrent abdominal pain. Patients are advised to have regular medical checkups, and when symptoms related to gall crystals or gallstones appear, they should seek medical attention promptly and make appropriate treatments under the guidance of their doctors.