Irritable and Gloomy for No Reason? Morning Mood Swings, a Red Flag from Your Body

Behind this emotional roller coaster we experience lies a complex and sophisticated bodily system. Morning mood swings in particular are deeply related to the cortisol awakening response in modern medicine. While cortisol is well known as a stress hormone, it is actually secreted rapidly when we wake up in the morning to prepare for daily activities, playing an important role in waking our body. However, if this cortisol secretion pattern is disrupted due to chronic stress or irregular lifestyle habits, it can cause excessive anxiety or irritability right from the morning. Additionally, an imbalance of neurotransmitters in the brain is an important cause. Serotonin, known as the happiness hormone, is essential for mood regulation; if problems arise in serotonin synthesis due to sleep deprivation, irregular eating habits, or deteriorated gut health, feelings of depression or anxiety can be amplified starting in the morning. Because approximately 90% of serotonin is produced in the gut, the importance of the gut-brain axis is being increasingly emphasized. This means that if the gut is not healthy, emotional regulation can also become difficult. Furthermore, an autonomic nervous system imbalance also contributes to morning mood swings. Our body’s autonomic nervous system is divided into sympathetic nerves and parasympathetic nerves, and modern individuals tend to experience hyperactivation of the sympathetic nerves due to stress. If the body fails to relax sufficiently overnight and the sympathetic nerves remain excessively elevated in the morning, one reacts sensitively to minor stimuli and easily becomes irritated. When blood glucose regulation issues are added on top of this, the situation can worsen further. Skipping breakfast or consuming primarily sweet foods can cause a blood sugar spike followed by rapid hypoglycemia, which can maximize sensitive and anxious feelings. Ultimately, morning mood swings can be considered an SOS signal sent jointly by diverse components that constitute our body, such as stress, sleep quality, dietary habits, gut health, and hormonal balance. Rather than blaming yourself by asking ‘Am I the problem?’, you will only be able to welcome a peaceful morning when you care for your body’s system healthily.