Watercress is not hairy, watercress in Chinese medicine has the function of stopping bleeding, benefiting qi, diuretic, lowering blood pressure and so on, it is not hairy. Moreover, under normal circumstances, it is also a food, and moderate consumption of it will not produce side effects or cause discomfort to most people, but only to some special physique and some diseases related to it will induce the onset of the disease. However, watercress belongs to the light-sensitive vegetables, if too much consumption is easy, and at the same time in the sun, there will be the possibility of sunburn. If these "light-sensitive food" or sun allergy, you need to be extra careful some of the food allergy should avoid eating allergic ingredients, sun allergy to avoid exposure to the sun, especially after eating "light-sensitive food" to avoid the sun.