What Are Rickets and Vitamin D Deficiency? Causes, Signs, and Prevention

Vitamin D is essential for strong bones, but when levels are low, it can lead to rickets in children, muscle weakness, fatigue, and a greater risk of fractures. In this article, we’ll explore how vitamin D deficiency contributes to rickets and what you can do to prevent and treat it.

What is Rickets?

Rickets is a condition that affects children’s developing bones, making them softer and less sturdy than normal. This can result in bone deformities, slower growth, and in severe cases, broken bones. It is most often seen in infants and young children, especially during rapid growth when strong bones are essential for healthy development [1].

Causes of Rickets

The most common cause of rickets is a deficiency in vitamin D, although calcium or phosphate deficiency can be also a contributing factor. The condition may result from [2]:

● Inadequate dietary intake of vitamin D

● Lack of sun exposure, which is needed for the skin to produce vitamin D

● Malabsorption disorders, like celiac disease or cystic fibrosis

● Liver or kidney diseases, which affect vitamin D metabolism

● Genetic disorders(e.g., X-linked hypophosphatemic rickets, a rare inherited form)

Role Of Vitamin D In Bone Health

Vitamin D is essential for calcium and phosphate absorption in the intestines.These minerals are necessary for the formation and maintenance of healthy bones.

How Your Body Processes And Uses Vitamin D

To produce vitamin D, your body follows a pathway as described below [2]:

● Vitamin D3 (cholecalciferol) is synthesized in the skin via sun exposure or obtained from the diet.

● It is then converted to 25-hydroxyvitamin D [25(OH)D] in the liver.

● This is further converted in the kidneys to its active form, 1,25-dihydroxyvitamin D [1,25(OH)₂D].

● This active form increases absorption of calcium and phosphate in the intestine, promoting proper bone mineralization (a process where essential minerals like calcium and phosphate get into the bone).

What Happens When Vitamin D Levels Are Low?

When your body doesn’t get enough vitamin D, it struggles to absorb calcium (a mineral essential for building strong, healthy bones). As calcium levels drop, the body releases parathyroid hormone (PTH) to compensate. This hormone pulls calcium from the bones and reduces phosphate levels in an effort to keep blood calcium stable.

Over time, this process weakens the bones and prevents them from hardening properly. In children, this can lead to rickets, which means soft, fragile bones and bone deformities if not addressed early.

What Are The Symptoms Of Rickets?

Changes in bone shape including:

• Legs that curve outward (bowed legs)
• Knees that angle inward and touch when standing (knock knees)
• Wrists and ankles that appear wider than normal
• Noticeable bumps along the rib cage
• Softer-than-normal skull bones in infants

Other possible symptoms include:

• Slower growth than expected
• Delayed developmental milestones
• Problems with tooth development
• Muscle weakness
• Seizures in severe cases, often linked to very low calcium levels

How Rickets Is Diagnosed

If your doctor suspects a bone problem in your growing child, they will start by looking for visible changes in bone development, such as unusual leg shape, delayed growth, or other signs that the bones may not be strengthening as expected.

To better understand what is happening inside the body, your doctor may recommend a few simple tests.

Blood tests can help show whether your child has enough vitamin D and important minerals needed for strong bones. These tests check vitamin D levels, calcium, phosphate, and certain hormones that help regulate bone health.

Your doctor may also request an X-ray, which allows them to see how your child’s bones are forming.

In children with rickets, the areas where bones are actively growing may appear wider or less defined than normal, a sign that the bones are not hardening properly.

Early diagnosis makes a big difference, because once identified, rickets is treatable and healthy bone development can often be restored.

How Rickets Is Treated

Treatment of rickets involves the following [3]:

1. Vitamin D Supplements

• Doctors often start treatment with a high dose of vitamin D to fix the deficiency.
• After that, children usually take a smaller daily dose (about 400–1000 IU, depending on age) to keep their bones healthy.

2. Calcium and Phosphate

• If a child doesn’t have enough calcium or phosphate, supplements can help strengthen their bones.

3. Sunlight

• Spending some time in the sun helps the body make vitamin D naturally.

4. Treating the Cause

• Sometimes rickets happens because of other health issues, like problems with digestion or the kidneys.

Preventing Rickets

The good news is that rickets is largely preventable with healthy habits and proper nutrition. Here are some simple ways to reduce the risk:

1. Get Enough Vitamin D

• Include vitamin D–rich foods in your diet, such as fortified milk, cereals, and other fortified products.
• Supplements may also be recommended, especially for those who are not getting enough through food alone.

2. Encourage Safe Sun Exposure

• Spending time outdoors helps the body naturally produce vitamin D. Just remember to balance sun exposure with proper skin protection.

3. Vitamin D for High-Risk Groups Some people need extra vitamin D to stay healthy:

• Exclusively breastfed infants: About 400 IU per day is recommended since breast milk may not provide enough vitamin D on its own [4].
• Pregnant and breastfeeding women: Around 600 IU daily, or more if advised by a healthcare provider.
• People with darker skin tones: They may need longer sun exposure to produce enough vitamin D.

Common Rickets FAQs

1. What age group is most at risk for rickets?

Rickets most often occurs in young children during rapid bone growth, especially between about 6 months and 3 years old, when they need vitamin D and calcium for healthy bone development. 

2. How is rickets diagnosed?

Doctors usually diagnose rickets with a physical exam, blood tests to check vitamin D and calcium levels, and sometimes X-rays to look at bone development. 

3. Can adults get rickets?

Adults don’t get rickets because their bones are already fully grown, but they can develop a similar condition called osteomalacia, which also softens the bones because of vitamin D deficiency.

4. Is rickets treatable?

Most cases of rickets can be treated and often reversed by giving vitamin D, calcium, and improving diet and sunlight exposure. Severe deformities might need braces or surgery.

5. Can rickets be prevented?

Yes. Making sure children get enough vitamin D (from sunlight, food, or supplements) and calcium in their diet can prevent most rickets. Pregnant women and breastfeeding infants may also need vitamin D supplements. 

6. What happens if rickets isn’t treated?

Untreated rickets can lead to lasting bone deformities, frequent fractures, stunted growth, and teeth problems. 

References

1. NHS England - Rickets And Osteomalacia
2. NIH - Vitamin D Metabolism
3. PMC - Diagnosis, Treatment, And Management Of Rickets
4. CDC - Vitamin D And Breastfeeding