If your colleague of the opposite sex is sick and sends a message of concern, what do you think of this problem?

Be concerned as a colleague, don't make a fuss! But if their text messages come too frequently, then ask! Generally speaking, if there is such a situation, she or he will tell you before or after sending it. At this time, be generous. After all, besides you, he or she needs to socialize. It's nothing to send a text message.