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How to increase penis size? 

some specialized exercises which can show an increase up to 5cm in size like jelqing exercises
get more healthy food that's rich in minerals and vitamins
 transdermal enlargement patches
using creams and gels
 penis enlargement pumps which increases the blood flow to penis and make it larger and more erection
hormone therapy
penis extender devices
penis enlargement surgery

Causes of small penis:

1. growth hormone deficiency
2. thyroid hormone deficiency
3. genetic causes
4. androgen insensitivity
5.  endocrine causes
6. hypogonadism

Definition of a short penis:

the average penis size varies between 4.6-6.4 inches and the penis is considered to be short when it is smaller than that

Advice:

Visit a urologist for physical examination and further assesment of the problem if the methods of tretment mentioned .above didn't work

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