Symptoms of low FSH deficiency in adult females at birth may include: 1. Your ovaries are not producing enough eggs. 2. Your pituitary glands are not working properly. 3. You have a problem with your hypothalamus, a part of the brain that controls your pituitary gland and other important body functions. 4. You are very underweight. If you are a man, low FSH levels can mean you have a disorder of the pituitary gland or hypothalamus. Low FSH levels in children can be a sign of delayed puberty. Delayed puberty can be caused by such as 1. A disorder of the ovaries or testicles 2. Turner syndrome in girls 3. Klinefelter syndrome in boys 4. A hormone deficiency 10. An eating disorder