People will quickly realize when they have had too much caffeine. Be aware of the following symptoms: nervousness a stomachache diarrhea a rapid or irregular heartbeat an increased rate of breathing insomnia feeling fidgety or restless sweating irritability anxiety attacks
People who stop consuming caffeine often complain of withdrawal. Symptoms include: general fatigue crankiness or irritability muscle pain nausea or an upset stomach a lack of focus headaches or migraines These symptoms may resolve when a person consumes caffeine again. If a person is determined to stop, withdrawal symptoms often pass within a few days.