Nothing really happen intell you loose alot.
Rapid hair loss is not normal. It usually indicates a disease or enlistment in the armed forces.
Anemia will not cause weight loss. Anemia is inadequate red blood cells in your blood.
While it is not life threatening to loose blood, it is fatal to loose a very large amont of blood. Which after, results in what is called a "memorage"
The average amount of blood lost during menstruation is around 30-40 milliliters, which is roughly 2-3 tablespoons. This can vary from person to person and cycle to cycle. If you are concerned about the amount of blood you are losing during your period, it's best to speak with a healthcare provider.
No it does not mean you are having a miscarriage, most likely you have hemorrhoids or anal fishers which are very common during pregnancy. You should tell your doctor so that he can prescribe you some hydro cortisone acetate or something similar to help sooth and heal the hemorrhoids. I am 29 weeks pregnant and have had this problem from the first trimester and it has helped me tremendously.
yes.....................................................
some people might die if they loose to much
Yes, it is not normal for a cat to have a loose tooth. If you notice this in your cat, it is important to consult a veterinarian for proper evaluation and treatment.
a lot of blood
No, it is not normal.
Vitamin K in the blood helps the blood to clot.