First, numbness and tingling in the arms and legs, mental disturbance, dizziness, and trembling and incoherent speech. These conditions, especially on the face or one side of the body, can be a precursor to a stroke, or stroke, signaling a blockage or rupture of an artery that supplies oxygen to the brain. If there is a problem with a large artery, a large part of the brain will be affected, leading to hemiplegia and loss of speech and other functions. If there is a problem with a small blood vessel, the arm or leg may go numb. You should seek medical attention immediately when these symptoms occur. Generally speaking, the best time to treat a blood clot is within three hours of its occurrence. Second, pain or discomfort in the chest, pain in the arms, both jaws, neck, sudden cold sweats, extreme weakness, nausea, vomiting, dizziness or shortness of breath. This is a precursor to a heart attack. In addition, some patients may have a “painless” heart attack in which the most critical precursors are: sudden onset of dizziness, increased heart rate, shortness of breath, nausea, vomiting, and cold sweats. If some of these symptoms occur, the first call to the emergency room should be 120. The patient can have an aspirin or nitroglycerin in his mouth to prevent damage to the heart muscle during a heart attack. Third, sore legs and stomach, chest pain, shortness of breath and coughing up blood. These are precursors of dangerous leg thrombosis. They are most likely to occur after prolonged sitting and can also occur after prolonged bed rest after surgery. Anyone can get this disease. After sitting and lying for a long time, blood accumulates in the legs, blood clots appear in the legs, and the calf stomach swells and hurts, and if there is sudden chest pain or shortness of breath, it means that the blood clots may have come off and entered the lungs through the blood. That is very dangerous, go to hospital immediately. Fourth, blood in urine without pain. If you find blood in your urine, you should go to the hospital even if there is no pain. Common causes of blood in urine are kidney stones, bladder or prostate infections. In serious cases, it may be cancer in the kidney, ureter, bladder or prostate. When the lesion is small, that is, curable, the patient usually has no pain. Therefore, if you find blood in urine, you should seek medical attention as soon as possible. Fifth, asthma is neither good nor bad. Asthma attacks are often accompanied by wheezing or difficulty breathing. If the symptoms do not subside and do not get worse, you should see an emergency room. If an asthma attack is left untreated, there is a risk of severe chest muscle fatigue, even leading to death. Sixth, depression and suicidal thoughts. Some people don’t seek help when they are depressed because they are afraid that others will think they are neurologically abnormal. In reality, the chemicals in their brain are out of balance. This is also a disease. Depression includes sadness, fatigue, apathy, anxiety, changes in sleep habits, and lack of appetite. The presence of these symptoms requires early attention and appropriate treatment.