Complaining of something and complaining about something are two different things. You can use both expressions when talking about negative feelings, but they are usually used in different contexts.

When you complain of something, it means that you are describing a physical feeling or something that you are experiencing. For example, you may complain of a headache or a sore throat. Here, the word of is used to express that the feeling is something that you are experiencing.

When you complain about something, it means that you are expressing dissatisfaction or annoyance with someone or something. For example, you may complain about the high price of gas or the slow service in a restaurant. Here, the word about is used to express that you are expressing your dissatisfaction with something.

So, in summary, the verbal phrase complain of is used to describe a physical or mental experience or condition while the phrase complain about is used to express dissatisfaction or annoyance with people or things.

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