The difference between Psidium guajava real and Psidium guajava seed is that there are differences in drug source, flavor and efficacy and action. 1. Different drug sources: Psidium guajava real, also known as Psidium guajava, is the dried mature fruit of Juniperus communis or Juniperus biloba of Cucurbitaceae; Psidium guajava seeds are the dried mature seeds of Juniperus communis or Juniperus biloba of Cucurbitaceae. 2. Different tastes: Psidium guajava is sweet, slightly bitter and cold in nature; Psidium guajava seeds are sweet in taste and cold in nature. 3. Differences in efficacy: Psidium guajava has the efficacy of clearing away heat and resolving phlegm, relaxing the chest and dispersing knots (relaxing the gathering of qi in the chest), and moistening the intestines and laxatives. It is used for lung-heat cough, phlegm yellow and sticky, chest paralysis (stuffy pain in the precordial region, or even chest pain through the back, not allowed to lie down), carbuncle (red, swollen and painful breasts, milk discharge is not smooth, and ultimately the formation of suppurative diseases), intestinal dryness and constipation and other diseases. Psidium guajava has the effect of moisturizing the lungs, resolving phlegm, and lubricating the intestines to relieve constipation. It is used for the treatment of dry cough with little phlegm, or phlegm sticky and difficult to cluck, intestinal dryness and constipation. There are certain differences between Psidium guajava and Psidium guajava seeds, which should be noted when using the drug clinically. The adverse reactions of these two drugs are not clear, and neither of them can be used in combination with Chuanwu, Caowu, or appendicitis. Chinese medicine should be used in professional Chinese medicine practitioners after identification, do not blindly self-medication, so as not to aggravate the condition or cause adverse reactions.