It's thought three factors combine to create them in the brain: biology (for example, hormones and brain chemicals), psychology (such as personality and learned responses), and environment (like illness and emotional stress). Common, everyday causes of a negative mood are: stress.
A process of brain remodelling happens throughout childhood, but most of it occurs during the teenage years and into the mid-20s. Brain remodelling doesn't always correspond with when a child experiences puberty, so you may notice changes in mood before you see physical changes, or vice versa.
Cyclothymia causes emotional ups and downs, but they're not as extreme as those in bipolar I or II disorder. With cyclothymia, you experience periods when your mood noticeably shifts up and down from your baseline. You may feel on top of the world for a time, followed by a low period when you feel somewhat down.
Dr. Stern says that an occasional meltdown is completely normal. “You may suddenly burst into tears or lash out with anger because you feel out of control, overwhelmed with pressures and things in your life that are unpredictable. That doesn't mean something is 'wrong' with you,” she says.
being easily irritated or agitated. being delusional, having hallucinations and disturbed or illogical thinking. not feeling like sleeping. doing things that often have disastrous consequences – such as spending large sums of money on expensive and sometimes unaffordable items.
People with ADHD also tend to feel anger, anxiety, frustration, or disappointment more intensely than others. (The same can be true of positive emotions.) They can have trouble putting the brakes on their feelings.
Personality changes can be caused by a mental illness like depression, bipolar disorder, or personality disorders. It may also be caused by physical illnesses like a urinary tract infection (especially in older adults), concussion, or brain tumor. Understanding the cause can help create an effective treatment.
As they move toward puberty, their hormones begin to fluctuate, causing emotional instability. 1 Tweens also lack the emotional development to fully control their moods. In other words, they express exactly what they're feeling like they're feeling it.
Young people may experience higher risk of mental health issues with early puberty. Those most frequent in the teenage years include anxiety and depression, eating disorders, conduct disorder (serious antisocial behaviour), attention deficit and hyperactivity disorder (ADHD) and self-harm.
Changing schools, bullying, a divorce, a new sibling, a family move, abuse or family conflicts can cause behavior disorders which can result in truancy, trouble with the law, substance abuse and mental health disorders such as depression and anxiety.
Mood changes may reflect a psychiatric disorder. For example, depression may cause sadness, irritability, anxiety, and a loss of interest and pleasure. Mood changes may also stem from a medical condition, such as thyroid disease or a neurological condition.
Symptoms of ADHD can have some overlap with symptoms of bipolar disorder. With ADHD, a child or teen may have rapid or impulsive speech, physical restlessness, trouble focusing, irritability, and, sometimes, defiant or oppositional behavior.
People who have ADHD frequently experience emotions so deeply that they become overwhelmed or “flooded.” They may feel joy, anger, pain, or confusion in a given situation—and the intensity may precede impulsive behaviors they regret later.
Grandiosity and overconfidence. Easy tearfulness, frequent sadness. Needing little sleep to feel rested. Uncharacteristic impulsive behavior.
Many people fall somewhere in the middle, meaning you might be sensitive, but not too overreactive. But if you tend toward 'A' behaviour, then yes, you have an overreactive personality. Overreactive tendencies tend to come hand-in-hand with other behaviours and symptoms, including: being impulsive.
Each person also varies from day to day, depending on the circumstances. However, a sudden, major change in personality and/or behavior, particularly one that is not related to an obvious event (such as taking a drug or losing a loved one), often indicates a problem.