Vitamin D - low enough to cause symptoms?

I apologize in advance if this isn’t the appropriate place to ask this.  

After over a year of unrelenting muscle fatigue and pain, and numerous tests, my internist suspected that I was low in Vitamin D.  The results show 25 on a scale of 30-80. The lab report shows this as “insufficient” rather than “deficient.”  I am now taking a prescription Vitamin D, 1.25 mg, weekly for the next 3 months.  

Is a Vitamin D “insufficiency” enough to cause symptoms, or would the results have to be lower in order to cause symptoms?

Thank you.

[Renee Radenberg]

Insufficiency may cause symptoms. Bone loss occurs and osteomalacia, in adults (rickets in children), results due to Vitamin D deficiency. Impaired Calcium absorption occurs due to very low levels of the vitamin. You did not mention your Calcium levels and suggest getting it checked. Vitamin D is available through our foods - Fortified milk, breakfast cereals, egg yolks, fatty fish, fish oils, and the sun. Sit at a window with the sun shining in for about 1/2 hour (few times a week) and that will help you get enough Vitamin D. Research has indicated harmful and, possible toxic, effects from excess amounts of Vitamin D and it is recommended not to exceed supplement 200 IU per day for adults over 25 years old.