A 20-year-old patient was delivered to a surgical unit complaining of an incised wound on his right forearm that has been bleeding for 1,5 days. Suffers from general weakness, vertigo, cold sweat, opplotentes. Skin and visible mucous membranes are pale. Heart rate is 110/min, BP is 100/70 mm Hg. Blood test: Hb is 100 g/l, erythrocytes 2,5 × 1012/l. What is the cause for the paient's general condition?