I have ear pain when I take a bath or use...

What are the most common cause of ear pain ?
the most common cause of ear pain is ear infection , but you need to be examined by ENT  specilasit to diagnose the cause of your ear problem , but here is the way to deal with ear infection
What is ear infection?
When the virus or bacteria causes infection to the area that lies behind the eardrum.
What causes ear infection?
Often stems from a previous infection of the respiratory tract that spreads to the ears.
The tube connecting the middle ear to the pharynx is blocked and the fluid collects behind the eardrum.
Bacteria often grow in liquid, causing pain and infection.
Vestibular nerve inflammation can cause, nerve balance paralysis due to viral infection in the inner ear which also can cause dizziness
There are a variety of symptoms associated with ear infections. Some of the most common are:
Ear pain
Irritability
Difficulty sleeping
Yellow, clear, or bloody discharge of the ears
Loss of balance and dizziness
Hearing problems
Diagnosis of Ear pain causes?
First, check your medical history
After that, physical examination.
Test the external ear and eardrum using a tool called an otoscope to check the signs of redness, swelling, pus, and fluid.
Also perform a test called a tympanometry hearing test to determine if the middle ear is working properly.
Some complications associated with ear infections are:
Infections that spread on the bones of the ear
Infections that spread to the fluid around the brain and spinal cord
Permanent hearing loss
Tear of the eardrum
What is the best way to treat ear infection?
Antibiotics are essential. Such as amoxicillin or augmentin for two weeks of treatment
tetracycline drops may be used
Analgesics such as paracetamol or diclofen in severe pain