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How to treat weak ererction

you can use drugs like sildenafil or vardenafil which augment erection and you should treat the cause if present as diabetes which should be treated by low calories diet and drugs to lower blood sugar like metformin and the cause may be low testosterone level which is treated by testosterone  injection 

How to diagnose weak ererction

you should do testosterone level in the blood and do the HBA1c to exclude the presence of diabetes and do the thyroid function test to exclude the presence of its disturbance

what is the causes of weak ererction

diabetes
thyroid disease
low testosterone level
depression

what is the associated symptoms with weak ererction

in diabetes there will be excessive urination and feeling thirsty
in low testosterone level there will be small size penis and testicles 
in hypothyroidism there will be swelling of legs and face 

advise

follow up with the physician to do the lab tests to diagnose the cause
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