Aisha, the wife of President Muhammadu Buhari, has been flown abroad for medical treatment.
The problem began when she returned to Abuja from Lagos, where she had gone to pay a condolence visit to Florence Ajimobi, the widow of former Ogun state Governor, Abiola Ajimobi.
Aisha went into self-isolation for 14 days after the Lagos trip.
However, the neck pain became worse and a decision was taken for her to seek medical advice abroad.
The First Lady, who is in stable condition, is now observing bed rest at an undisclosed hospital.