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Muscle pain (Myalgia) – Discomfort or soreness in the muscles, often due to overuse, strain, or illness.
Migraine – A severe headache often accompanied by nausea, vomiting, and sensitivity to light or sound.
Memory loss – Difficulty recalling information or past events, which can be linked to various conditions.
Mouth sores (Canker sores) – Painful lesions inside the mouth, often due to stress, infection, or irritation.
Muscle weakness – Reduced strength in muscles, often caused by injury, disease, or lack of use.
Malaise – A general feeling of discomfort, unease, or illness.
Menstrual cramps – Pain in the lower abdomen, often during menstruation.
Mucus buildup – Excess mucus production in the nose or throat, often due to infections or allergies.
Moist skin – Sweating or damp skin, sometimes linked to fever, anxiety, or hyperhidrosis.
Muffled hearing – Hearing loss or a sensation of fullness in the ears, often due to an ear infection or blockage.
Morning sickness – Nausea and vomiting experienced by pregnant women, especially in the early stages of pregnancy.
Mottled skin – Skin discoloration, often appearing as blotchy patches, sometimes linked to circulation or vascular issues.

Mood swings – Rapid changes in emotional state, often seen in bipolar disorder or hormone fluctuations.
Mental fog – Difficulty concentrating or thinking clearly, often associated with stress, fatigue, or medical conditions like fibromyalgia.
Mistrust – A feeling of distrust or suspicion toward others, which can occur in anxiety or certain personality disorders.
Motivational issues – Lack of drive or desire to engage in activities, commonly seen in depression or burnout.
Mania – A state of elevated mood, energy, and impulsivity, often seen in bipolar disorder.
Mind racing – Constantly having fast or uncontrollable thoughts, often associated with anxiety or stress.
Miscommunication – Difficulty expressing oneself clearly or understanding others, which can occur in various cognitive or mental conditions.
Monotony – Feeling of boredom or dissatisfaction from repetitive tasks or situations, which can affect motivation or mood.
Memory problems – Difficulty with recall, which can occur with aging, trauma, or neurological conditions like dementia.
Maladaptive coping – Unhealthy or ineffective ways of managing stress, such as avoidance or substance abuse.