Which of these symptoms may be caused by excessive psychological stress?

Excessive psychological stress can lead to a variety of physical and mental symptoms, and recognizing these symptoms is crucial for overall well-being. Insomnia is a common response to high levels of stress, as anxiety and worry can disrupt the natural sleep cycle. Headaches may also occur, as stress can trigger tension and exacerbate existing headache disorders. Additionally, loss of appetite is another frequent manifestation of stress, where individuals may find it difficult to eat or may have diminished interest in food due to the mental toll of anxiety. Since all these symptoms can coexist and are indeed related to excessive psychological stress, the correct answer encompasses the full range of these effects, confirming that all listed options — insomnia, headaches, and loss of appetite — can occur as a result of significant stress.