People with BMI (body mass index) less than 18.5 are called underweight. Genetics, high metabolism, drug abuse, lack of food, bulimia, anorexia nervosa, and chronic illness can make a person underweight.

Recently Answered Questions Recently Answered Questions

All the answers published in this website are written by Verified medical doctors, therapists and health experts. The Content has been moderated by iCliniq medical review team before publication. Post your medical clarifications on iCliniq by choosing the right specialty and get them answered. Your medical queries will be answered 24/7 by top doctors from iCliniq.

Why can I not stop throwing up?

Query: Hello I have a condition when I can't stop throwing up. I've had it my whole life. When I became older my condition became more stable, but still, every time I start to feel nausea - it can be very serious Recently I came back from work and when to bed, as usual, But when I woke up I started to fee...  Read Full »

Dr. Nishant

General Practitioner, Family Physician

Answer: Hi . I understand your concern . But please calm down. I will help you treat your condition. I see that you are currently in the premenstrual period. So such symptoms occur during this time. Also, you mentioned stress which is not good for the gut. - First of all, I would like you to start Tablet ...  Read Full »

Why do I feel full after eating very less since childhood?

Query: Hi. Age is 38 years. 1. I don't feel appetite from my childhood normally I can not eat normal meal like others. 2. When I feel hunger and eating after the very less food the feeling of fullness come and I cannot eat more. I am under weight and bones on my face r visible which doesn't look nice. (Ea...  Read Full »

Dr. Ajeet Kumar Lohana

Medical Gastroenterologist

Answer: Hello dear. I welcome you to icliniq. Well I do not think, that I may be able to tell you the underlying cause for it, but here are some thoughts which I want to determine. There are certain conditions which can cause decreased appetite and weight loss plus early satiety. These condition are gast...  Read Full »

Please suggest to gain weight as I weighs only about 36 kg for 23 years of age.

Query: Hello doctor, I am a 23-year-old male. My height is 165 cm and weighs about 36 kg. I am weak and my body is very slim and thin. Please help me to gain weight.  Read Full »

Dr. Theresa M. Gregory

Infertility Specialist

Answer: Hello, Welcome to icliniq.com. It would be a good idea to have a complete physical checkup with your family doctor to determine if there are any medical reasons for your slight build and to make sure there are not unknown causes. If you feel that you are weak and want to gain weight and build mus...  Read Full »

Will nutrigain work for any age?

Query: Hello doctor, Will nutrigain work for any age since I am 40 years and underweight.  Read Full »

Dr. Vinod Kumar

Yoga Specialist

Answer: Hello, Welcome to icliniq.com. It is always wrong to think of some short cut methods of weight gain. I have repeatedly been telling in my replies to different people asking about weight gain or weight loss, that it is a matter of difference between calorie intake and calorie requirements. This par...  Read Full »

I am underweight and my BMI is 16.5. Kindly help me to put on weight.

Query: Hello doctor, I am underweight and my BMI is 16.5. Kindly help me to put on weight.  Read Full »

Dr. Mahboob Ali

Unani Medicine Specialist, Ayurveda Specialist

Answer: Hello, Welcome to icliniq.com. First, you explain about your daily routine, and like and dislike foods.  Read Full »

How to gain weight as I am underweight and more vulnerable to climate change?

Query: Hello doctor, I am 32 years old. I am underweight and my BMI is low (below 18). I do not have any other medical issues. But, I used to get vulnerable cold and cough to climate change.  Read Full »

Dr. Shakti Mishra

Fitness Expert, Nutritionist, Physiotherapist, Yoga Specialist

Answer: Hi, Welcome to icliniq.com. Basically, your immune system is very weak. Some people like you are very much prone to cold and cough, because of which the body's normal biological systems gets disturbed during each season. When our immune system gets altered our antigens, which are the fighting soldie...  Read Full »

What can be done to improve the appetite of 22 months old baby?

Query: Hello doctor, My 22 months old baby girl had a fever on Wednesday and was on Babygesic and Sinarest-AF drops for cold and fever. Until now she did not have fever but now she has raised temperature. She has not eaten solids from Wednesday. I am very worried. Please help. She is such a poor eater and...  Read Full »

Dr. Shilpa Reddy Diggireddy


Answer: Hello, Welcome to icliniq.com. First of all your baby is quite underweight. She has to be above 13 kg by 22 months (attachment removed to protect patient identity). Coming to the fever part, she requires an antibiotic for the fever to subside. Please give her syrup Azee (Azithromycin) 200 - 2.5ml ...  Read Full »

My son is active but his weight and height are of major concern. Kindly help.

Query: Hello doctor,My child is 3 years 1 month now. His birth weight is 2.7 kg. At the end of the first year, he was 7.5 kg. At the end of the second year, he was 9 kg. Now he is 11 kg. He is extremely active and thoughtful but his weight and height are our major concerns. Kindly help.  Read Full »

Dr. Mahmoud Ahmed Abelrahman Abouibrahim

Internal Medicine Physician, Family Physician, General Practitioner, General Medicine Physician

Answer: Hello, Welcome to icliniq.com. I understand your concerns. From what you mentioned, your son is underweight. I suggest that you perform stool analysis in order to exclude any parasitic infection. Also, a hemoglobin test is required to exclude possible anemia. I suggest Dexorange syrup as a multiv...  Read Full »

Can body heat cause chickenpox?

Query: Hello doctor, My daughter got chickenpox last year. During that time we did not take her out and applied neem leave paste. It got cured in 15 days. Now, this year also, again she got chickenpox. Now, she is 4 years old. What to do now? Why has it come again?  She ate chicken and mango the same day....  Read Full »

Dr. Faisal Abdul Karim Malim

Child Health Specialist, Paediatrician

Answer: Hi, Welcome to icliniq.com. Firstly, I would want to know if the diagnosis of chickenpox is made by you or a doctor. It is highly unlikely for anybody to get chickenpox twice and even if the person gets chickenpox twice least likely it would be once every year. Her weight 11 kg is very less for...  Read Full »

I am on a diet and not getting regular monthly period. What to do?

Query: Hello doctor, Over the last several months, I have been dieting to lose weight that I gained last summer. Though my weight has fluctuated over the months, I have lost approximately 10 lbs. I am also an athlete, and thus I exercise daily. After the first two months of dieting, I noticed that I did no...  Read Full »

Dr. Sweta Singh

Infertility Specialist, Obstetrician And Gynaecologist

Answer: Hi, Welcome to icliniq.com. You are very underweight, and that is why your menstrual cycles are not coming usually. My advice would be to stop dieting. Follow a regular healthy diet and exercise in moderation. You are nearly anorexic, and that will wreak havoc with your bones and hormones. Just hav...  Read Full »

ask-doctor-img Ask a Doctor Online

* guaranteed answer within 4 hours
Chat with a Doctor

Chat with a Doctor

Starting @ just $29.99

Search for a Health Issue


Disclaimer: All health Q&As published on this website are not intended to be a substitute for professional medical diagnosis, advice or treatment by a trained physician. Seek the advice from your physician or other qualified health-care providers with questions you may have regarding your symptoms and medical condition for a complete medical diagnosis. Do not delay or disregard seeking professional medical advice because of something you have read on this website.