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Treatment for weak sperms:
First of all, you should undergo a full medical examination at the urology clinic to detect the cause and treat it. As the treatment depends mainly on knowing the cause. In cases of varicocele, which is one of the main causes of poor sperm count and movement, it is treated surgically. In cases of presence prostate infections, antibiotics such as Levofloxacin can be prescribed. Other treatments, such as CARNITINE and TRENTAL medications can be used. In addition to vitamin E, zinc and folic acid. Also we recommend you to follow a healthy diet rich in vitamins and eat fish and nuts. Furthermore, you should make some excercises, quit smoking if you do smoke, get enough sleep and rest during the day, and avoid stress and anxiety.
Diagnosis:
Clinical medical examination by a urologist. Complete blood count test to detect the presence of anemia or infections. Semen analysis to detect prostate infections. Urine analysis to exclude infections in the urinary tract. Hormonal tests can also be tested such as testosterone, TSH and prolactin. Also, testicular imaging with ultrasound to exclude the presence of varicose or any other problems in the testicle.
Causes of weak sperm:
1. Varicocele
2. Prostatitis 
3. Lack of testosterone
4. Obesity
5. Smoking and drinking alcohol
6. Testicular atrophy
7. Thyroid disease
8. Others

Recommendation:
It's recommended to see a urologist for further assessment.