Multiple Sclerosis (MS)
With this condition, your immune system attacks the nerves in your brain and spine. It can cause problems ranging from bladder issues to not being able to walk. In some cases, it can lead to a feeling of euphoria, where your happiness is beyond normal and out of touch with reality. It can also bring on laughing or crying that seems out of control or not in line with how you really feel.
Thyroid Disease
The thyroid makes hormones that tell your body how fast or slow to work. If it makes too much of those, it can feel like someone stomped on the gas pedal. You might be irritable, anxious, and have big mood swings. If you don’t make enough of those hormones, your personality may seem flat. You may be forgetful and have a hard time thinking things through. It can have long-lasting effects on your brain if it’s not treated.