Rarely, cancer causes swollen lymph nodes. Get answers about where stem cells come from, why they're important for understanding and treating disease, and how they are used. Do和does的区别和用法区别是：do 是动词原形，用于第一人称、第三人称的复数 (i/you/we/they)。does 用于第三人称单数 (he/she/it) does 用于第三人称单数。do用于一般现.
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Symptoms muscle cramps occur mostly in leg muscles, most often in the calf. Cramps usually last for seconds to minutes. Learn about symptoms of urinary tract infections.
Swollen lymph nodes most often happen because of infection from bacteria or viruses.
What's different and what's alike between these two kinds of health care providers? The lymph nodes, also called lymph. Statin side effects can be uncomfortable but are rarely dangerous. Means, but what does d.o.
Help to do sth.：词性为动词短语，该短语中的help后面跟着不定式（to do），表示主动帮助他人完成某件事情。 help doing sth.：词性为动词短语，该短语中的help后面跟着动名词（doing），. Do their homework 做作业，do do their homework 确实有做作业，主语是 they ，故用 do 对do their homework中的do 进行强调：确实. Find out what causes utis, how infections are treated and ways to prevent repeat utis. The boys do do their homework after school every day.
