Hi, Severe leg cramps, dizziness, and nausea can be caused by a variety of underlying medical conditions, some of which may require urgent medical attention. Here are a few possibilities: * Dehydration: Dehydration can cause muscle cramps, dizziness, and nausea. Encourage your husband to drink plenty of fluids and electrolyte-rich drinks. * Electrolyte imbalance: Electrolytes like sodium, potassium, and calcium helps regulate muscle and nerve function. An imbalance in these electrolytes can lead to muscle cramps, dizziness, and nausea. * Medications: Some medications can cause leg cramps, dizziness, and nausea as side effects. If your husband is taking any medications, it may be worth discussing the possibility of side effects with his healthcare provider. * Neurological disorders: Certain neurological disorders can cause muscle cramps, dizziness, and nausea. For example, Parkinson s disease and multiple sclerosis can cause muscle spasms and cramps. * Cardiovascular problems: Dizziness and nausea can also be symptoms of cardiovascular problems like low blood pressure or an irregular heartbeat. * Other medical conditions: Other medical conditions that may cause muscle cramps, dizziness, and nausea include kidney disease, diabetes, and hypothyroidism. It s important to note that these are just a few possibilities and that there may be other underlying medical conditions that could be causing your husband s symptoms. I would recommend that he sees his healthcare provider as soon as possible for a comprehensive evaluation and appropriate treatment. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician