Lymphatic constitution is a kind of special constitution, belonging to an abnormality of the immune system, and the following symptoms can generally appear: First, for example, the main characteristic of thymic lymphatic constitution is thymus hypertrophy and lymphatic tissue hyperplasia of the whole body, and the people with thymic lymphatic constitution may have a sudden death when subjected to minor external stimuli such as quarrelling, emotionally agitated, exercising, minor illnesses, vaccinations, minor surgeries, blood sampling, etc., or even having nightmares in their sleep. Nightmares may lead to sudden death in people with thymic lymphoid constitution. Secondly, not only the thymus gland is enlarged, but also the whole body lymphatic tissue hyperplasia, the heart is smaller than normal, the adrenal glands and gonads are underdeveloped, and the secondary sexual characteristics are not obvious, and so on. To summarize, people with lymphatic constitution are generally smaller as well as fragile, and may die suddenly due to sudden death from vaccines, minor surgeries, blood tests and other situations.