Hello, Dizziness and imbalance while walking may be due to vestibular issues and other medical conditions affecting the neck or the back, spinal cord problems, peripheral neuropathy. Sprains of muscles and ligaments, head injury, trauma to the brain or concussion, intake of alcohol, certain medications, etc. Nerve damage in the neck or back can cause loss of balance while walking. Neurological conditions like Peripheral neuropathy, Parkinson s disease, spinal cord problems or injury to the nerves can cause balance problems while walking. Certain sensory integration issues can affect a person’s reactions to light, sound, touch and movement may trigger loss of balance while walking. Conditions affecting the joints, muscles, ligaments and surrounding tissues can cause loss of balance while walking. Injuries to bones and soft tissues too can cause difficulty in walking with easy loss of balance and co-ordination. Disorders affecting the eye, vision and aging problems, cataracts, glaucoma, degeneration, complications of diabetes and other retinal problems may have difficulty in seeing and balancing while walking. You are suggested to get your dad clinically examined for factors that may lead to the symptoms stated above. He may have to get a complete medical check up along with investigations and imaging tests done. He will be accordingly treated. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician