Nepal's prime minister has asked neighboring India to lift an "undeclared blockade," saying the Himalayan nation is facing a severe fuel shortage and trouble obtaining medicine and food supplies blocked at the border.

Prime Minister Khadga Prasad Oli in a televised address on Sunday said Nepal is facing a humanitarian crisis because of the trouble at the border points.

Nepal has been facing severe fuel shortages in the past two months because India has restricted imports of fuel.

India, which has been supplying most of the oil products for Nepal, is unhappy with the new constitution adopted in September.

People have been forced to line up at fuel stations and travel on bus roofs, and schools have been shut down.

The shortages have also led to price increases for food and other basics.