U.S. Sen. Rand Paul has five rib fractures and lung contusions as a result of an apparent assault Friday by a neighbor at Paul's home in Bowling Green, a spokesman for Kentucky's junior senator said Sunday.

Senior adviser Doug Stafford said Paul's injuries cause pain that could persist for weeks, perhaps even months, but that the Republican plans to return to the U.S. Senate soon.

“Senator Paul has five rib fractures including 3 displaced fractures," Stafford said in a statement emailed to the Daily News by Paul's staff. "This type of injury is caused by high velocity severe force. It is not clear exactly how soon he will return to work, as the pain is considerable as is the difficulty in getting around, including flying."

Rene Boucher, 59, a Bowling Green doctor, was arrested Friday and charged with fourth-degree assault after an incident at Paul's home in the gated Rivergreen community just east of Bowling Green.

Boucher, 582 Rivergreen Lane, was released Saturday night from the Warren County Regional Jail on a $7,500 bond, according to online jail records.

The arrest warrant in the case indicates that Paul told police that his neighbor came onto his property and tackled him from behind, forcing him to the ground and causing pain. According to the warrant for Boucher's arrest, Paul had injuries to his face and had trouble breathing due to a rib injury.

"Senator Paul and Kelley appreciate everyone’s thoughts and well wishes and he will be back fighting for liberty in the Senate soon," Stafford said in his statement Sunday.

A news release from Kentucky State Police Post 3 in Bowling Green said troopers were called to the Paul residence at 3:21 p.m. Friday.

According to the release, Boucher was arrested by Trooper Bartley Weaver and charged with assaulting Paul, who has been Kentucky’s junior senator since 2011.

Boucher is a Bowling Green anesthesiologist and pain specialist who developed a product called Therm-a-Vest, a cloth vest partially filled with rice and secured by Velcro straps that is designed to relieve back pain by delivering heat directly to the areas of the back where most pain is felt.

Boucher applied for a patent for the vest in 2003 and has marketed it through the QVC shopping channel.

An arrest warrant for Boucher was issued through the Warren County Attorney’s office. The charge of fourth-degree assault is a Class A misdemeanor punishable by up to 12 months in jail. Warren County Attorney Amy Milliken said further charges could be brought, based on the extent of Paul’s injuries.

The investigation by Weaver is continuing.

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