What causes twitching in biceps for a longer period of time?

Hi doctor,

I have been having continuous twitching in my right bicep where the tendon meets the elbow. This has been happening for last seven weeks and the vibration of the twitching when I am resting my elbow (say on a table while using a mouse) is quite large enough for my entire arm. I have no associated muscle weakness in the right arm and an electromyography (EMG) and nerve conduction study (NCS) done last week have come clear saying it is a potentially benign fasciculation. A full magnetic resonance imaging (MRI) scan of the spine and brain has shown no abnormalities. My concern is that the twitching has not stopped for such a long period. Is there cause for concern for this to be a motor neuron disease? Currently, I am taking Lyrica 75 mg and Rejunex CD3.

Thank you doctor,

Only in specific fibers of the right bicep, continuous all the time at almost one per second, sometimes a bit irregular. The remaining right bicep is silent and adjoining muscles are silent.

Thank you doctor,

No pain in the neck or radiating pain. I have been lifting heavy weights over last six months, fairly intense at times, 2 to 3 times a week. Plus undergoing physiotherapy for a knee injury twice a week.