What are the main symptoms of Vitamin D deficiency?

The common symptoms I find in general practice are musculoskeletal pains. But vitamin D is involved in so many other body processes, not just bone and muscle health. It has roles in the immune system, in blood sugar regulation, cancer prevention, it helps to reduce inflammation and is important in mental illness too. It is a factor in the development of osteoporosis and rickets in children if it is persistently very low. 

Microvascular and Lymphatic Dysfunction in HFpEF and its associated comorbidities

Ilona Cuijpers, Steven J Simmonds, Marc van Bilsen, Elzbieta Czarnowska, Arantxa Gonzalez Miqueo, Stephane Heymans, Annika R Kuhn, Paul Mulder, Anna Ratajska, Elizabeth A.V. Jones & Ebba Brakenhielm.
Lay Summary – Coronary Microvascular Dysfunction, the links to chronic low-grade inflammation and HfPef with possible new treatment and management therapies.
 https://link.springer.com/article/10.1007/s00395-020-0798-y