A small nodule next to the horizontal fissure of the right lung means that CT examination reveals the presence of a dense shadow of less than 3 cm between the middle and lower lobes of the right lung (i.e. the horizontal fissure). It may be due to lung infection and lung cancer etc. After 2 weeks of oral antibiotics, if there is no change or the nodule becomes smaller, it is considered to be caused by inflammation, and regular review is needed in the later stage; if the nodule is found to be significantly changed or there are signs such as burr sign, it is considered to be lung cancer, and it is recommended that puncture biopsy be performed in time to clarify the nature of the lesion, and then surgical treatment should be taken. Patients with right lung paravascular nodule should go to the hospital if they have fever, weight loss, chest pain, cough, dyspnea, hemoptysis and other symptoms. Patients should take proper rest and avoid overwork in daily life. Eat more high-energy food to supplement nutrition. Patients can carry out appropriate training to improve immunity, avoid traveling on hazy days, stay away from dusty places or work.