Ive alwayd had pain in my belly button, the inside...

What are the causes of belly button pain?
1. Bloating, gas and constipation 
2. The appendicities
3. female reproductive system disease such as polyps and cysts 
4. Kidney stones
what to do next :
- consult internal medicine doctor, and surgeon or gynecologist may be consulted
do the necessary tests such as:
1. Clinical examination
2. Blood tests
3. kidney function test
4. Urine and stool examination
5. abdominal imaging test : US
6. Checking the level of reproductive hormones
What are the treatment options:
1. Medicines for treating constipation and flatulence, such as: Simethicone and Laaxative
2. Initial antibiotics to treat appendicitis, such as Flagyl medication, and surgery may be needed in severe cases 
3. For cases of the reproductive system medical condition , oral pain relievers and drugs for regulating reproductive hormones and menstruation may be needed , such as Duphaston and birth control pills
4. in case of kidney stones Medicines to expand the urinary tract such as tamsulosin, and surgery may be needed to remove the stones (if any).