Patients with Legionella infection may experience weakness, muscle pain, headache, fever and other symptoms in the early stage, and may experience difficulty in breathing and impaired consciousness in the later stage. Patients infected with Legionella may experience weakness, muscle pain, headache, fever and other symptoms in the early stage, and some weaker patients may also experience hemoptysis, coughing up sputum, coughing and other symptoms in the early stage. As the disease worsens, patients may experience chest pain, dyspnea, and diarrhea, nausea, vomiting, diarrhea and other discomforts, and further development of psychiatric symptoms, generally manifested as tremor of the limbs, impaired consciousness, unsteady walking, limb paralysis, and so on, and continued deterioration of the liver function, kidney function will cause irreversible damage, and even life-threatening. If the patient is unwell or suspected of being infected with Legionella, it is recommended to go to the hospital for diagnosis and treatment in a timely manner, so as to avoid delaying the condition and causing greater damage to the body.