An overactive thyroid (hyperthyroidism), may cause you to experience unusual nervousness, restlessness, anxiety and irritability.

• Difficulty sleeping
• Fatigue
• A rapid or irregular heartbeat
• A fine tremor of your hands or fingers
• An increase in perspiration
• Sensitivity to heat
• Weight loss, despite normal food intake
• Brittle hair
• Enlargement of your thyroid gland (goiter)
• Change in menstrual cycles
• Frequent bowel movements

Calcitonin is produced by the thyroid and serves to build up or strengthen bones, it activates the oseoblasts, producing a decrease in calcium concentration

PTH or the Parathyroid Hormone is produced by the parathyroid gland and serves to increase calcium concentration by activating the osteoclast, which break down bone.

Source

Introduction to the Human Body

by Gerard Tortora and Bryan Derrickson

The endocrine is one of the most important systems of the body. There are two systems that control the body, endocrine and nervous. The endocrine is basically producing and managing your hormones, making sure there isn't too much or too little. In the pituitary gland alone you secrete 9 hormones such as:

1) Growth Hormone (GH) - which codes for your body to grow. If you have to much of this you have Giantism, which is lethal and you grow to be a giant. Those who have too little Growth hormones have a condition called Pituitary Dwarfism.

2)Antidiuretic hormone (ADH) - basically maintains your fluid volume. Monitoring your blood, water, urine, etc. volume, making sure you don't get dehydrated by not allowing the formation of urine. If your ADH levels are to low, you can get Diabetes Insipidus or suffer severe dehydration.

3) Thyroid Stimulating Hormone (TSH) - stimulates the thyroid to release the thyroid hormone. Decreased TSH levels can create Cretinism in children and increased levels can cause hyperthyroidism, Graves Disease, and similar.

4) Adrenocorticotropic Hormone (ACTH) - causes the release of glucocorticoids (which are essential to life influencing the energy metabolism of most body cells and they help us resist stressors) and androgens. It is very rare to have decreased levels, however increased levels of ACTH cause Cushings Disease.

5) Follicle-stimulating hormone (FSH) - in females it stimulates ovarian follicle maturation and the production of estrogen. In males stimulates sperm production. Too little causes failure of sexual maturation while there is no effect should you have an overproduction.

6)Luteinizing Hormone (LH) - in females triggers ovulation and stimulates the ovarian production of estrogen and progesterone; in males LH promotes testosterone production. The effects of too high and too little are the same as for FSH.

7) Prolactin (PRL) - promotes lactation; too little causes poor milk production in nursing women while too high causes inappropriate milk production and impotence and breast enlargement.

8) Oxytocin - stimulates uterine contraction, stimulates labor, and initiates milk injection; there are no known effects for too high or too little amounts of Oxytocin.

9) Parathyroid Hormone (PTH) -

Testosterone

As A Female gets older the gradually produce more Testosterone.... As a Boy gets Older He Produces less Estrogen and More Testoterone.... testosterone works in sync with human growth hormone which is why men are mostly taller and more heavily built. This leads me into believing that men die younger because they have to much testoterone.... the More testosterone the older a person looks also. This also leads me to thinking that human Growth hormon Makes skin Grow even when the Elasticity of skin remains. The More skin The Less Elasticity, The More Wrinkles.

in any case, for a woman to stay hairless they would need less testosterone in order to not grow hairs as quick. This also means that Human Growth Hormone is released through the Day in very small doses. and when you sleep more is released.

Hair growth is increased while your asleep so in order to prevent gair growth you would have to use a cream during the night to weaken hair growth, this weaken the nutrients that allow hairs to grow. Unfortunaty, such hairloss products with out an understanding can increase cancers along the nervous system, just like how botox can travel and inflame nerve cells so can hair reduction kill of those cells. its all connected. The more hair growth usually means healthy cells. This is Because when a cell Dies is Can Become a Hair folicals core. So The Less Cancers exist when hair is produced from a dead cell. Hair cells also protect other healthy cells in the Skin.

Its Best Not To use any Hair weakening Or Reduction creams to reduce hair production, Shaving is the best Way, But When you shave you allow Microscopic germs to enter the Stem thus Causing Infimation in the Skin. So That another reason to wear aftershaves or an Anti-bacterial Cream after shaving. Its all New stuff. But if You manage to question how things work in you body, you can usually find a Healthy solution without causing any problems in the long term.

So, In order to produce less Hair, you need more estrogen but with a substited human growth hormone so you can prevent any cancers. You Can Shave like normal and use an antibacterial cream to prevent Microscopic germs from infecting a cell, Just remember that natural creams from herbal products are best to use as chemically produced creams can have side effects. A natural anti-bacterial would be Oderless Garlic or Onion Juice, This Is Because They Are Hot watery Acids. Onion can Rejuvinate a Dying skin cell by removing dirt and Saturated Fats Around it. Skin Cells Can Be Rejuvinated in that Sence by drinking the Right Amount of water per day, which is Usually 250mls of water every 2 hours per day. Water is activated by heat and swet helps to clean the skin of dirt and fats. But The sun Can Enhance the Waters Cleaning effects Under the skin also. The sun activates The Hydrogen in the Skin and Turns it into A Mild Acid.

Sorry if ive gone off topic. Hope You have enough info.