Which symptom is associated with both stimulant use and withdrawal?

Loss of appetite is a symptom that can be observed both during the use of stimulants and during withdrawal. Stimulants, such as cocaine or amphetamines, often suppress appetite as they increase levels of certain neurotransmitters in the brain that can reduce feelings of hunger. During withdrawal from these substances, individuals may also experience loss of appetite as their bodies adjust back to a state without the stimulant's influence.

In contrast, increased energy is typically a symptom associated with stimulant use due to their stimulating effects on the central nervous system, making it less relevant in the context of withdrawal. Constipation is generally not a common symptom linked to stimulant use but can occur for various other reasons unrelated to stimulant use or withdrawal. Heightened reflexes are usually observed under the stimulating effects of these substances rather than during withdrawal, when reflexes may actually be subdued as the body undergoes a process of balancing itself after ceasing stimulant use.