Eyebrows fall off as soon as they are plucked may be due to normal physiological reasons, or it may be due to disease factors such as generalized baldness, hypothyroidism, syphilis, and so on. 1. Normal physiological factors: eyebrows belong to a kind of human hair, divided into the growth period, degeneration and resting period, in the latter two periods of the eyebrow hair will naturally fall off, gently plucked with the hand will accelerate the shedding, which is a normal phenomenon, the eyebrow hair will also be long to appear, to maintain the dynamic equilibrium. 2. Generalized baldness: when the condition of baldness is serious, it may lead to easy loss of eyebrows, eyelashes, armpit hair, etc., and there will be sudden and limited patchy hair loss. 3. Hypothyroidism: Patients may have typical low metabolism symptoms such as fatigue, fear of cold, slowness of movement, memory loss, etc. They may also have the symptoms of thinning, drying and easy shedding of hair. 4. Syphilis: syphilis causes hair loss generally in the six months after infection with syphilis, manifested as small and scattered pieces of hair loss, some patients’ eyebrows, eyelashes, etc. are also prone to fall off. Eyebrows plucked off may also be caused by other factors, it is recommended that patients do not need to be overly nervous, if the eyebrows did not grow out for a long time, or accompanied by other symptoms, the need to consult a doctor in a timely manner, in order to clarify the cause of the symptomatic treatment.