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Nausea – A feeling of unease or discomfort in the stomach, often leading to the urge to vomit.
Numbness – A loss of sensation, often in the hands, feet, or other body parts, which can indicate nerve issues or circulation problems.
Neck pain – Discomfort or pain in the neck, often caused by muscle strain, injury, or poor posture.
Nasal congestion – Blockage or stuffiness in the nose, typically due to a cold, allergies, or sinus infection.
Nosebleeds (Epistaxis) – Bleeding from the nose, often caused by dryness, injury, or underlying health conditions.
Nodules – Small, hard lumps under the skin, often related to benign growths, cysts, or thyroid problems.
Nystagmus – Involuntary eye movements that can affect vision and balance.
Nerve pain (Neuropathy) – Burning, tingling, or sharp pain caused by nerve damage.
Night sweats – Excessive sweating during sleep, often linked to infections, menopause, or certain medical conditions.
Nausea with dizziness – A combination of feeling nauseous and lightheaded, possibly indicating an inner ear issue, vertigo, or low blood pressure.

Nervousness – Feelings of anxiety or unease, often accompanied by physical symptoms like sweating or shaking.
Negative thinking – Pessimistic or self-critical thoughts that can impact mental health, often linked to depression or anxiety.
Narcissism – An excessive sense of self-importance and lack of empathy, often linked to narcissistic personality disorder.
Nostalgia – Longing or sentimental affection for the past, which can sometimes cause feelings of sadness or longing.
Neurosis – A term used for a range of mental health disorders marked by anxiety, depression, and other emotional disturbances.
Numbness of emotion – Feeling emotionally detached or disconnected from one's own feelings, often seen in depression or trauma.
Nightmares – Disturbing dreams that cause anxiety or fear, often associated with stress, trauma, or PTSD.
Nervous breakdown – A period of intense mental distress or collapse due to overwhelming stress, leading to an inability to function normally.
Nihilism – The belief that life is meaningless or that nothing has value, often linked to depression or existential crises.
Narrowed focus – A state where thoughts or attention are fixated on a particular subject, sometimes seen in anxiety or obsessive-compulsive disorder (OCD).