Urea 14C Capsule may cause stomach upset, nausea, and vomiting in patients, and it can also have some radiation effects on the body. Urea 14C capsule is a drug used to diagnose Helicobacter pylori infection. First of all, the capsule itself will irritate the gastric mucosa, causing stomach discomfort in some patients. There are also some patients who will experience nausea and vomiting after taking Urea 14C capsules. These symptoms do not require special treatment and can be helped by taking warm water as appropriate. Secondly, 14C belongs to a radioactive substance, which has a certain radiation effect on the human body, especially pregnant women, it is not suitable to swallow urea 14C capsules for related examinations. In addition, teenagers are in the golden period of growth and development, should also be cautious to use urea [14C] capsules for examination. Based on the radiation of 14C, so pregnant women, breastfeeding and children should use Urea 14C capsules with caution. Patients should be tested under a doctor’s supervision when taking Urea 14C capsules. If H. pylori infection is detected, they should go to regular hospitals for examination and treatment.