What should be noted for ureteral stones?

Patient's question:

Recently, I've been experiencing left abdominal pain. I went to the hospital for an ultrasound, and the results were as follows:
A 4mm stone near the bladder opening in the left ureter, with left kidney hydronephrosis.
The doctor prescribed me Jin Qian Cao (Chinese herb), Ciprofloxacin tablets, and Panadol, and told me to drink more water.
How long does it usually take for the stone to pass?
Is the left ureter blocked? If so, won't the left kidney always be hydronephrotic? What are the risks?
First follow-up question: How can I know if the stone has passed?
Does it mean everything is fine if the pain stops?

Doctor's answer:

If the stone cannot be passed within 3 days, I suggest you consider cystoscopy stone removal or ultrasound lithotripsy. Of course, we cannot allow the kidney to continue to develop hydronephrosis. I believe everyone knows that assisted reproductive technology causes significant harm to patients, so it is important to receive treatment as soon as possible. In daily life, pay attention to dietary issues, and maintain a light diet, avoiding irritating foods. Additionally, regular follow-up visits can be scheduled when necessary.

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