"Do I have a swollen and painful left lymph node?"

Swollen and painful lymph nodes on one side of the neck can be caused by various factors such as stress, illness, or fatigue. In most cases, this issue tends to resolve on its own without any need for worry. It is advisable to avoid touching or rubbing the affected area to prevent irritation and possibly slow down the healing process. If the symptoms persist for more than two weeks without improvement, it would be prudent to seek medical advice. In the meantime, feel free to ask any further questions if needed.