Tongue diagnosis is the key to traditional Chinese medicine, the tongue is the seedling of the heart, the spleen is outside, and the moss is born from the stomach qi. Tongue diagnosis mainly examines the shape, color, and dryness of the tongue texture and tongue coating, so as to judge the nature of the disease, the depth of the disease, the prosperity and decline of qi and blood, the profit and loss of fluid, and the deficiency and reality of the viscera. People who love to get angry and are prone to emotional disorders, and people who are prone to anger are sharp, long, and red-colored, like a blazing bayonet, which is easy to cut through the original balance. 
This is an obvious manifestation of "depression", just like Sister Lin in "Dream of Red Mansions", such people are generally thinner, often depressed, sentimental, loss of appetite, easy to panic, insomnia. People with depressed constitution like to sigh and are prone to insomnia, depression, plum nucleus, neurosis, etc. The ability to adapt to mental stimulation is relatively poor, the personality is introverted and unstable, melancholy and fragile, sensitive and suspicious, the body is emaciated, and the complexion is pale or yellow. 
But it seems that the temper does not seem to be very good, either excited and irritable, or depressed and uncomfortable. Once sick, the chest and ribs are swollen or painful, headache and dizziness. Women will have more obvious breast tenderness and less abdominal distension pain before menstruation. Sometimes breast and lower abdomen distension pain, menstrual irregularities, dysmenorrhea. Obstruction in the pharynx, such as foreign body, cervical gall, stomach and bladder distension, pantositic acid, hiccups. The most common are sleep disorders and insomnia, either difficulty falling asleep, or easy to wake up from sleep, or often dreaming, often sleeping all night but feeling the same as not sleeping. 
People who are depressed are more likely than ordinary people to enter the "abyss" of depression, mania, insomnia, anxiety and other diseases. 
The characteristics of this constitution can be seen and felt by the naked eye. Take an example from the perspective of yin and yang, and you will understand what the problem is. First of all, let's start with sleep, sleep to replenish yin, exercise to replenish yang, a person can only be healthy if yin and yang are balanced, which is a big premise. At night, people's yang energy decreases, and if you stay up late and don't sleep, it will not only hurt your yang energy, but also damage your yin essence. People who stay up late for a long time are usually haggard, rough and easy to age, easy to be irritable or depressed, etc., all due to long-term injury and blood. 
The problem of sleep is a big problem. Don't underestimate this, you must know that some of our ** diseases are from sleep**, and the effect is very good. When the heart is in a state of rest, and at this time the blood is returned to the liver, and the ugly time (1 3 o'clock) is the time when the liver meridian is running, and the purpose is to "purify" the blood from dirt. If the blood is not pure, all diseases will be born. Why do they say that it is not fatal to not sleep after 12 o'clock, after this time it begins to be the circulation time of the heart, liver, gallbladder lungs and large intestines, and every time it passes will lead to its dysfunction, and it is not uncommon for discomfort to occur. 
"The "time" here not only refers to the four seasons of health, but also the 24 hours of this day, which should also be paid attention to. The reason why patients with depression fall deeper and deeper is that many of them are at this time, they don't sleep at night, they don't have enough yin energy, they don't exercise, and their yang energy is thrown away. How can it be okay?It's only going to get worse!What is a disease after a long period of depression?Disease is change. The disease accumulates to a certain degree and has not yet formed a disease, but there are obvious changes that can be seen. If it is controlled in time, it will not develop to illness, and if it is not controlled, it will develop to illness. 
Of the three stages of illness, depression is the first stage, the cause, and the first stage. Illness is the process of illness and is the second stage. Illness is the result, it is really sick, it is the third stage. The physiological activities of the human body are based on matter, and without yin essence, there is no way to produce yang energy. How can a car start without gas. Thanks to the Yang Qi, the internal organs can be functioning normally, and only then can the water valley and other nutritious foods be continuously turned into yin essence. If yin and yang cannot be separated from each other, human life will cease. Traditional Chinese medicine treatment is to correct deviations and correct the deviations in the normal operation of the human body, which is the reason why traditional Chinese medicine is diversified and effective, and sometimes even the combination of yang and yin.