If there is significant swelling within a joint, you will lose range of motion — the limb will only go so far in each direction.

如果关节存在严重的肿胀，就会无法活动——肢体在每个方向上的活动范围都十分有限。

youdao

You would not even know that this process is going on because there are no identifiable symptoms such as pain, swelling, redness and heat.

你甚至不知道状况如何，因为没有任何诸如疼痛，肿胀，发红或者发热的症状。

youdao

It is rarely life-threatening. There is no specific treatment for the disease but analgesics and non-steroidal anti-inflammatory medication may be used to reduce the pain and swelling.

该病很少会威胁生命，也没有特定的治疗办法，但可以使用止痛药和非甾体抗炎药减轻疼痛和肿胀。

youdao

However, similar symptoms may also occur if there's an injury, swelling or infection of various parts of the male anatomy, so it is important that a physician make the diagnosis if something abnormal is found on a self-exam.

CNN: Should teen boys check testicles regularly?