Mental agitation is the inner weather that will not clear: irritation without a clear cause, racing thoughts, a tight chest, a mood that swings before lunch and changes again by evening. It can follow a hard day or arrive for no obvious reason. Left alone, it colors how we speak, decide and treat the people nearest to us.
The Gita offers a useful way to read these shifts. Gita 14.10 explains that the three gunas (qualities of nature: sattva, rajas and tamas) are always present together, and at any moment one prevails over the other two. That is why moods and motivation keep changing. Gita 7.12 adds that these qualities arise and pass within a larger awareness. Gita 2.45 then urges us to rise above their pull and stay centered.
Practice follows from that insight. Gita 6.12 recommends daily, one-pointed meditation with controlled senses, and Gita 17.16 describes mastery of the mind as calmness, gentleness, quiet reflection and clean intentions. Gita 6.27 says a peaceful mind, free from the agitation of passion, finds deep happiness. Nurture sattva through healthy habits, good company and reflection. If agitation is severe or lasts for weeks, please also speak with a doctor or counsellor.